Pressure(bpp1)
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This document discusses the concept of pressure and provides examples. Pressure is defined as force per unit area, with the standard SI unit being the pascal (Pa). Higher pressures are caused by large forces applied over small areas, while lower pressures result from smaller forces applied over large areas. Examples are given of applications requiring high pressure, like nails, and low pressure, like caterpillar tracks. The document also provides a formula for calculating pressure and works through examples of determining pressure exerted by human feet on the ground.
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Thrust and pressure ppt
This document defines thrust as a force applied perpendicular to a surface, measured in Newtons. It explains that pressure is the effect of thrust per unit area, calculated as thrust divided by area, with units of Pascals. It provides examples of how pressure depends on both the applied force and the contact area, with greater force or smaller area resulting in higher pressure. Specifically, it notes that a sharp knife cuts better than a blunt one because the same force is applied over a smaller area, creating greater pressure.
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The document discusses pressure and provides examples of calculating pressure using the formula pressure = force/area. It explains that pressure is measured in pascals or newtons per square meter. The document also discusses how hydraulic systems use Pascal's principle to multiply force over different piston areas to transmit pressure equally throughout the liquid.
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The document discusses different types of forces including contact forces and non-contact forces. It provides examples of how pressure depends on force and area. It explains that pressure increases with decreasing surface area and gives examples like sharp knives having higher pressure than blunt knives. Other examples discussed include football boots, skis, and tractors where pressure is an important factor. The document also discusses liquid pressure and how it increases with depth and does not depend on container shape.
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Force is a push or pull on an object, while pressure is the amount of force applied over an area. There are different types of scales and gauges to measure force and pressure. A spring scale measures force by how far a spring stretches under the force of an object. A balanced scale uses levers to balance the force of objects on either side. Pressure is calculated by dividing the total force by the area it is applied to. Common pressure gauges include the Bourdon, Schrader, and diaphragm gauges.
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This document provides information about force and pressure in physics for class 8. It discusses that force has magnitude and direction, is represented by an arrow, and does not affect the mass of an object. It also explains the turning effect of force, called moment, which depends on the force and perpendicular distance from the pivot point. Further, it defines pressure as the force per unit area and discusses how liquid pressure increases with depth due to the weight of the liquid above. Archimedes' principle of upthrust or buoyancy is also summarized.
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This document discusses thrust, pressure, and how pressure depends on force and area. It defines thrust as a force applied perpendicular to a surface, and pressure as the effect of thrust per unit area. Pressure is calculated as thrust divided by area. It states that the same force will produce less pressure if applied over a large area versus a small area. It provides everyday examples to illustrate this principle, such as school bags having wide straps, knives needing to be sharp to concentrate force over a small area, and buildings and dams having wide foundations to reduce pressure.
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This document discusses different types of forces:
1) Contact forces include muscular force, friction, and gravity. Muscular force is exerted by muscles, friction opposes motion between surfaces in contact, and gravity causes things to fall toward Earth.
2) Non-contact forces include magnetic force, electrostatic force, and pressure. Magnetic force pulls materials together without contact, electrostatic force is the attraction or repulsion between charged bodies, and pressure is the force applied per unit area.
3) Pressure increases with decreasing surface area or increasing depth in liquids, as the same force applied over a smaller area produces higher pressure. Liquids exert pressure on the bottom of their container that depends on the height of the liquid
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Thrust and pressure ppt
This document defines thrust as a force applied perpendicular to a surface, measured in Newtons. It explains that pressure is the effect of thrust per unit area, calculated as thrust divided by area, with units of Pascals. It provides examples of how pressure depends on both the applied force and the contact area, with greater force or smaller area resulting in higher pressure. Specifically, it notes that a sharp knife cuts better than a blunt one because the same force is applied over a smaller area, creating greater pressure.
Pressure
The document discusses pressure and provides examples of calculating pressure using the formula pressure = force/area. It explains that pressure is measured in pascals or newtons per square meter. The document also discusses how hydraulic systems use Pascal's principle to multiply force over different piston areas to transmit pressure equally throughout the liquid.
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The document discusses different types of forces including contact forces and non-contact forces. It provides examples of how pressure depends on force and area. It explains that pressure increases with decreasing surface area and gives examples like sharp knives having higher pressure than blunt knives. Other examples discussed include football boots, skis, and tractors where pressure is an important factor. The document also discusses liquid pressure and how it increases with depth and does not depend on container shape.
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Force is a push or pull on an object, while pressure is the amount of force applied over an area. There are different types of scales and gauges to measure force and pressure. A spring scale measures force by how far a spring stretches under the force of an object. A balanced scale uses levers to balance the force of objects on either side. Pressure is calculated by dividing the total force by the area it is applied to. Common pressure gauges include the Bourdon, Schrader, and diaphragm gauges.
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This document provides information about force and pressure in physics for class 8. It discusses that force has magnitude and direction, is represented by an arrow, and does not affect the mass of an object. It also explains the turning effect of force, called moment, which depends on the force and perpendicular distance from the pivot point. Further, it defines pressure as the force per unit area and discusses how liquid pressure increases with depth due to the weight of the liquid above. Archimedes' principle of upthrust or buoyancy is also summarized.
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This document discusses thrust, pressure, and how pressure depends on force and area. It defines thrust as a force applied perpendicular to a surface, and pressure as the effect of thrust per unit area. Pressure is calculated as thrust divided by area. It states that the same force will produce less pressure if applied over a large area versus a small area. It provides everyday examples to illustrate this principle, such as school bags having wide straps, knives needing to be sharp to concentrate force over a small area, and buildings and dams having wide foundations to reduce pressure.
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This document discusses different types of forces:
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2) Non-contact forces include magnetic force, electrostatic force, and pressure. Magnetic force pulls materials together without contact, electrostatic force is the attraction or repulsion between charged bodies, and pressure is the force applied per unit area.
3) Pressure increases with decreasing surface area or increasing depth in liquids, as the same force applied over a smaller area produces higher pressure. Liquids exert pressure on the bottom of their container that depends on the height of the liquid
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Pressure is defined as force per unit area. It allows heavy loads to be supported inside car tires and causes feet to sink into soft ground. Increased pressure inside a pressure cooker allows food to cook more quickly at a high temperature. The pressure depends on both the force applied and the surface area, with greater pressure resulting from either a higher force or smaller surface area. Examples include skis distributing force over a large area to reduce pressure on snow, and sharp knives concentrating force into a small area to cut with high pressure.
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Thrust is the force applied perpendicular to a surface. Pressure is the effect of thrust per unit area and is calculated as thrust divided by area. Pressure depends on both the force and the area it acts upon - greater force or smaller area results in higher pressure. Examples are given where distributing force over a larger area reduces pressure, such as wide straps on school bags, broad tractor tires, and foundations of buildings.
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3) Fluids exert buoyant forces on objects within them depending on factors like the object and fluid densities. Bernoulli's principle and Pascal's principle describe how pressure changes within moving fluids.
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Pressure is defined as force per unit area. It allows heavy loads to be supported inside car tires and causes feet to sink into soft ground. Increased pressure inside a pressure cooker allows food to cook more quickly at a high temperature. The pressure depends on both the force applied and the surface area, with greater pressure resulting from either a higher force or smaller surface area. Examples include skis distributing force over a large area to reduce pressure on snow, and sharp knives concentrating force into a small area to cut with high pressure.
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The document defines thrust as a force applied perpendicularly to a surface, while pressure is the effect of thrust per unit area. Pressure depends on both the applied force and the contact area - the same force will produce less pressure over a larger area but more pressure over a smaller area. Everyday examples are provided like school bags distributing weight over shoulders, knives cutting with focused force, and vehicle tires spreading weight to reduce sinking.
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Pressure depends on the force applied over an area. It can be increased by either increasing the force or decreasing the area over which the force is applied. Pressure is calculated as force divided by area. Pressure acts equally in all directions within fluids as the particles collide with surfaces. Air pressure decreases with increasing elevation due to lower density, while water pressure increases greatly with depth.
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Pascal's principle states that when force is applied to a confined liquid, the change in pressure is transmitted equally to all parts of the fluid. A force applied to one section of an enclosed liquid at rest will be transferred to the entire liquid with the same amount of force. Hydraulic systems use this principle - a force applied to one piston increases the fluid pressure throughout the fluid, so if the second piston has a larger surface area, the force is multiplied.
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The document discusses different forces exerted by water and air. There are two main forces of water: upthrust force, which causes objects to float, and water resistance, which pushes against moving objects in water. Air also exerts forces, including air resistance, which slows down moving objects by pushing against them, with larger objects experiencing greater resistance. Air resistance can be useful, as seen with parachutes which use the force of air to slow a falling object.
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Forces can be pushes, pulls, or a combination of both. A force is any interaction between two objects that causes a change in motion or shape. There are two main types of forces - contact forces that act when objects touch, and non-contact forces that act over a distance like magnetic or gravitational forces. Pressure is the amount of force applied over a given area, and depends on both the force and the contact area. Applying force over a smaller area results in greater pressure.
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This document defines key concepts related to thrust, pressure, and buoyancy. It begins by explaining that thrust is the force acting perpendicularly on a surface, while pressure is the thrust acting on a unit area of the surface. It then discusses how a thumb applies less pressure than a drawing pin due to differences in surface area. The document later defines pressure in terms of thrust and explains that buoyant force is the upward force exerted on an object immersed in a liquid. In closing, it defines density as the mass of a substance per unit volume.
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Force is any influence that causes an object to change its motion, shape, or state of rest. There are different types of forces, including contact forces that require touching an object, like pushing a table. Balanced forces occur when multiple forces cancel each other out, while unbalanced forces result in a net force that changes the motion of an object. Internal forces cause acceleration within an object due to its mass, while external forces interact with the environment and are needed to move objects.
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Forces in fluids can be summarized as follows:
1) Newton's laws apply to all forces, including those exerted by fluids like gases and liquids. Gravity and friction are key forces that affect motion in fluids.
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3) Fluids exert buoyant forces on objects within them depending on factors like the object and fluid densities. Bernoulli's principle and Pascal's principle describe how pressure changes within moving fluids.
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This document discusses the concept of force. It begins by asking what force is present in space and how we should define force. It then outlines a 4 day plan to cover topics related to force, including introduction to force, different types of force, pressure, and atmospheric pressure. Key points covered include that force is an external agent that can change an object's motion, direction, or shape. Force has both magnitude and direction. Contact forces require interaction between objects, while non-contact forces do not. Examples of different types of forces like magnetic, frictional and pressure forces are provided. Pressure is defined as the force applied per unit area. Atmospheric pressure is also discussed.
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The document discusses pressure and how it relates to area. It provides examples of how broader areas are used to decrease pressure in situations like building foundations, school bag straps, and military tanks. It also explains how trains are laid on sleepers to reduce the pressure exerted on the earth, and how cutting tools have sharp edges to apply high pressure with small forces. Liquid pressure is defined as being equal to the fluid density multiplied by gravity and height. Pressure is the force applied per unit area.
Pressure
Pressure is defined as force per unit area. It can be measured in units such as pounds per square inch, atmospheres, or pascals. Air pressure in the atmosphere is caused by gas molecules constantly colliding with surfaces and exerting force. Standard air pressure at sea level is approximately 101 kPa or 14.7 psi. Pressure calculations involve dividing the total force by the area over which that force is applied.
Pressure
An elephant exerts less pressure than a person in high heels because its weight is distributed over a larger surface area. Pressure is calculated by dividing force by area, so a greater surface area means less pressure. This is why a person can lie on a bed of nails - the nails increase the surface area and reduce the pressure, so it does not puncture the skin. Pressure is reduced by increasing surface area and increased by decreasing surface area.
Friction.pptx
This document provides an overview of friction for an 8th grade science class. It defines friction as a force that opposes motion between two surfaces. It describes the four main types of friction - sliding, fluid, rolling, and static friction. It explains that friction occurs due to the microscopic roughness of surfaces and depends on factors like roughness and applied force. Examples are given for each type of friction. The document also discusses ways to reduce and increase friction and gives examples of how friction can be both helpful and harmful.
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Basic(nuclear ms4)
This document discusses the structure of atoms and nuclear particles. It explains that atoms are made up of protons, neutrons, and electrons. The number of protons defines the element, while the number of neutrons defines the isotope. It also describes nuclear reactions like alpha decay, beta decay, and gamma decay. Nuclear fission and fusion reactions are explained. Different radioactive particles and their penetrating abilities are defined. Isotopes of elements are given as examples.
Electro magnetic wave(bpp)
This document discusses electromagnetic waves and their classification according to frequency. Electromagnetic waves include radio waves, microwaves, infrared radiation, visible light, ultraviolet radiation, X-rays, and gamma rays. All electromagnetic waves travel at the speed of light and differ in frequency and wavelength, with higher frequency waves having shorter wavelengths and higher energy. Examples are given of how each type of electromagnetic wave is used technologically and occurs naturally.
Wave nature (Basic science)
The document discusses different types of waves. It defines a wave as the transfer of energy through vibration. There are two main types of waves - transverse waves, where the vibration is perpendicular to the direction of travel, and longitudinal waves, where the vibration is parallel. Key wave properties discussed include wavelength, frequency, amplitude, and speed. Various wave equations are also presented, such as the relationship between wavelength and frequency in determining wave speed.
Velocity ok
1. The document discusses various concepts related to one-dimensional motion including position, distance, displacement, speed, velocity, and acceleration.
2. It defines key terms like displacement as the change in position of an object, velocity as a vector quantity that includes both speed and direction, and acceleration as the rate of change of velocity with respect to time.
3. Examples and equations are provided to calculate quantities like average speed, average velocity, and instantaneous velocity from distance-time graphs or data tables.
Displacement
The document discusses key concepts related to motion including position, displacement, distance, speed and velocity. It defines displacement as a vector quantity that involves both magnitude (distance) and direction, while distance is a scalar quantity involving only magnitude. The document provides examples of how to calculate average speed using displacement and time data from graphs or tables, and how the slope of a distance-time graph directly relates to velocity. Key concepts are explained through diagrams and examples to illustrate the differences between and applications of displacement, distance, speed and velocity.
Fluids14
1. The document discusses Pascal's law and how hydraulic systems work by transmitting pressure through an incompressible liquid. It provides equations to calculate pressure, force, and displacement in hydraulic systems. Examples are given to demonstrate calculating pressure, load lifted, and displacement of pistons in hydraulic presses and jacks.
2. The document explains that Pascal's law states that pressure is transmitted equally throughout a liquid. It then provides equations showing that the pressure, force and displacement are proportional to the ratio of the piston areas in a hydraulic system. Examples are worked out to calculate pressure, load lifted, and piston displacement.
3. Hydraulic systems are described as using an incompressible liquid to transmit pressure between
Intro physicsquantity
The document discusses the benefits of exercise for mental health. Regular physical activity can help reduce anxiety and depression and improve mood and cognitive function. Exercise causes chemical changes in the brain that may help protect against mental illness and improve symptoms.
Fluids 11 density
This document contains physics problems and questions for students in MS.5/1-2 at Banphue pittayasan School, taught by Mr. Chaiporn Pattanajak. It includes questions about the mass and volume of materials, calculating air mass in a room, properties of aluminum including density, and calculating mass, volume, and density from provided data for different crowns. Students are asked to show their work and solutions.
Density(bpp)
1. Density is defined as mass per unit volume. It allows objects of the same mass but different volumes to be distinguished.
2. The document provides examples of calculating density for regular and irregular solids, liquids, and gases using mass and volume measurements. Common density values are also listed for various materials like wood, water, iron, aluminum, etc.
3. Problems are presented where the user must apply the density equation (Density = Mass / Volume) to calculate density given mass and volume or identify a material based on its known density.
Density(bpp)
1. The document discusses density and how it is calculated for different materials and objects. Density is defined as mass per unit volume. Examples are given for calculating density of regular solids, irregular solids, liquids, and gases by measuring mass and volume.
2. Several word problems are provided as examples of calculating density given the mass and volume of an object or substance.
Electric static (part i introduction)
This document discusses static electricity and how objects become electrically charged. It describes three main ways that objects can become charged: 1) charging by friction, where electrons are transferred between two objects in contact with each other; 2) charging by conduction, where charge flows through a conducting material when it touches a charged object; and 3) charging by induction, where a charged object induces a charge in a nearby object without direct contact. The document also discusses properties of charges, insulators and conductors, electroscopes for detecting charge, lightning formation in clouds, and how a Van de Graaff generator works to produce high voltages.
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Introduction
The notion of Dwayne Johnson kidnapping seems straight out of a Hollywood thriller. Dwayne "The Rock" Johnson, known for his larger-than-life persona, immense popularity. and action-packed filmography, is the last person anyone would envision being a victim of kidnapping. Yet, the bizarre and riveting tale of such an incident, filled with twists and turns. has captured the imagination of many. In this article, we delve into the intricate details of this astonishing event. exploring every aspect, from the dramatic rescue operation to the aftermath and the lessons learned.
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The Origins of the Dwayne Johnson Kidnapping Saga
Dwayne Johnson: A Brief Background
Before discussing the specifics of the kidnapping. it is crucial to understand who Dwayne Johnson is and why his kidnapping would be so significant. Born May 2, 1972, Dwayne Douglas Johnson is an American actor, producer, businessman. and former professional wrestler. Known by his ring name, "The Rock," he gained fame in the World Wrestling Federation (WWF, now WWE) before transitioning to a successful career in Hollywood.
Johnson's filmography includes blockbuster hits such as "The Fast and the Furious" series, "Jumanji," "Moana," and "San Andreas." His charismatic personality, impressive physique. and action-star status have made him a beloved figure worldwide. Thus, the news of his kidnapping would send shockwaves across the globe.
Setting the Scene: The Day of the Kidnapping
The incident of Dwayne Johnson's kidnapping began on an ordinary day. Johnson was filming his latest high-octane action film set to break box office records. The location was a remote yet scenic area. chosen for its rugged terrain and breathtaking vistas. perfect for the film's climactic scenes.
But, beneath the veneer of normalcy, a sinister plot was unfolding. Unbeknownst to Johnson and his team, a group of criminals had planned his abduction. hoping to leverage his celebrity status for a hefty ransom. The stage was set for an event that would soon dominate worldwide headlines and social media feeds.
The Abduction: Unfolding the Dwayne Johnson Kidnapping
The Moment of Capture
On the day of the kidnapping, everything seemed to be proceeding as usual on set. Johnson and his co-stars and crew were engrossed in shooting a particularly demanding scene. As the day wore on, the production team took a short break. providing the kidnappers with the perfect opportunity to strike.
The abduction was executed with military precision. A group of masked men, armed and organized, infiltrated the set. They created chaos, taking advantage of the confusion to isolate Johnson. Johnson was outnumbered and caught off guard despite his formidable strength and fighting skills. The kidnappers overpowered him, bundled him into a waiting vehicle. and sped away, leaving everyone on set in a state of shock and disbelief.
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留信网认证的作用:
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3:国家专业人才认证中心颁发入库证书
4:这个认证书并且可以归档倒地方
5:凡事获得留信网入网的信息将会逐步更新到个人身份内，将在公安局网内查询个人身份证信息后，同步读取人才网入库信息
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Leonardo DiCaprio House: Malibu Beachfront Retreat
A Prime Location
His Malibu beachfront house is one of the most famous properties in Leonardo DiCaprio's real estate portfolio. Situated in the exclusive Carbon Beach. also known as "Billionaire's Beach," this property boasts stunning ocean views and private beach access. The "Leonardo DiCaprio house" in Malibu is a testament to the actor's love for the sea and his penchant for luxurious living.
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The Malibu house features a modern design with clean lines, large windows. and open spaces blending indoor and outdoor living. The expansive deck and patio areas provide ample space for entertaining guests or enjoying a quiet sunset. The house has state-of-the-art amenities. including a gourmet kitchen, a home theatre, and many guest suites.
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Another remarkable property in Leonardo DiCaprio's collection is his Hollywood Hills house. This secluded retreat offers privacy and tranquility. making it an ideal escape from the hustle and bustle of Los Angeles. The "Leonardo DiCaprio house" in Hollywood Hills nestled among lush greenery. and offers panoramic views of the city and surrounding landscapes.
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学校原件一模一样【微信：741003700 】《(Mercer毕业证书)摩斯大学毕业证》【微信：741003700 】学位证，留信认证（真实可查，永久存档）原件一模一样纸张工艺/offer、雅思、外壳等材料/诚信可靠,可直接看成品样本，帮您解决无法毕业带来的各种难题！外壳，原版制作，诚信可靠，可直接看成品样本。行业标杆！精益求精，诚心合作，真诚制作！多年品质 ,按需精细制作，24小时接单,全套进口原装设备。十五年致力于帮助留学生解决难题，包您满意。
本公司拥有海外各大学样板无数，能完美还原。
1:1完美还原海外各大学毕业材料上的工艺：水印，阴影底纹，钢印LOGO烫金烫银，LOGO烫金烫银复合重叠。文字图案浮雕、激光镭射、紫外荧光、温感、复印防伪等防伪工艺。材料咨询办理、认证咨询办理请加学历顾问Q/微741003700
【主营项目】
一.毕业证【q微741003700】成绩单、使馆认证、教育部认证、雅思托福成绩单、学生卡等！
二.真实使馆公证(即留学回国人员证明,不成功不收费)
三.真实教育部学历学位认证（教育部存档！教育部留服网站永久可查）
四.办理各国各大学文凭(一对一专业服务,可全程监控跟踪进度)
如果您处于以下几种情况：
◇在校期间，因各种原因未能顺利毕业……拿不到官方毕业证【q/微741003700】
◇面对父母的压力，希望尽快拿到；
◇不清楚认证流程以及材料该如何准备；
◇回国时间很长，忘记办理；
◇回国马上就要找工作，办给用人单位看；
◇企事业单位必须要求办理的
◇需要报考公务员、购买免税车、落转户口
◇申请留学生创业基金
留信网认证的作用:
1:该专业认证可证明留学生真实身份
2:同时对留学生所学专业登记给予评定
3:国家专业人才认证中心颁发入库证书
4:这个认证书并且可以归档倒地方
5:凡事获得留信网入网的信息将会逐步更新到个人身份内，将在公安局网内查询个人身份证信息后，同步读取人才网入库信息
6:个人职称评审加20分
7:个人信誉贷款加10分
8:在国家人才网主办的国家网络招聘大会中纳入资料，供国家高端企业选择人才
原版制作(MUN毕业证书)纽芬兰纪念大学毕业证PDF成绩单一模一样
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本公司拥有海外各大学样板无数，能完美还原。
1:1完美还原海外各大学毕业材料上的工艺：水印，阴影底纹，钢印LOGO烫金烫银，LOGO烫金烫银复合重叠。文字图案浮雕、激光镭射、紫外荧光、温感、复印防伪等防伪工艺。材料咨询办理、认证咨询办理请加学历顾问Q/微741003700
【主营项目】
一.毕业证【q微741003700】成绩单、使馆认证、教育部认证、雅思托福成绩单、学生卡等！
二.真实使馆公证(即留学回国人员证明,不成功不收费)
三.真实教育部学历学位认证（教育部存档！教育部留服网站永久可查）
四.办理各国各大学文凭(一对一专业服务,可全程监控跟踪进度)
如果您处于以下几种情况：
◇在校期间，因各种原因未能顺利毕业……拿不到官方毕业证【q/微741003700】
◇面对父母的压力，希望尽快拿到；
◇不清楚认证流程以及材料该如何准备；
◇回国时间很长，忘记办理；
◇回国马上就要找工作，办给用人单位看；
◇企事业单位必须要求办理的
◇需要报考公务员、购买免税车、落转户口
◇申请留学生创业基金
留信网认证的作用:
1:该专业认证可证明留学生真实身份
2:同时对留学生所学专业登记给予评定
3:国家专业人才认证中心颁发入库证书
4:这个认证书并且可以归档倒地方
5:凡事获得留信网入网的信息将会逐步更新到个人身份内，将在公安局网内查询个人身份证信息后，同步读取人才网入库信息
6:个人职称评审加20分
7:个人信誉贷款加10分
8:在国家人才网主办的国家网络招聘大会中纳入资料，供国家高端企业选择人才
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Pressure(bpp1)
- 1. Pressure Modify : Chaiporn Pattanajak Banphue pittayasan School Udonthani Thailand
- 2. Is a pushing force
- 3. Pressure is when a push, squashes something Walking pushes on the ground, if the ground is soft it gets squashed and we leave footprints
- 4. If the ground is very soft we leave deep footprints
- 5. We can make less deep footprints by spreading out our weight (push) with special shoes.
- 6. Which shoes do you think will push hardest on the floor?
- 7. Sensible shoes? • The force of our body pushing down will exert a pressure • The surface area of our shoes in contact with the ground will affect the pressure • These stiletto shoes will concentrate the force over a small area • These shoes will give a larger pressure and would not be suitable for walking on soft ground
- 8. More sensible shoes • These boots have a large surface area • The weight of a person is spread out over the larger surface • The pressure exerted by the person is smaller than if they were wearing stiletto shoes • A small pressure means you will not sink into soft ground
- 9. Examples of where a large area is needed to reduce pressure. Caterpillar tracks on diggers and on tanks Tyres on a tractor Skis and snowboards snowshoes
- 10. Examples of where a small area is needed to increase the pressure • Nails • Needles • Kitchen knives • Scissors • Drawing pins • Spade
- 11. Questions on pressure 1) What combination of force and area give a high pressure? 2) What combination of force and area give a low pressure? 3) What is the formula for calculating pressure? 4) What units are pressure given in? Answers: 1) Large force and small area 2) Small force on large area 3) Pressure = force /area 4) Pascals (Pa)
- 12. Press urePressure is define as force per unit area, where the force F is understood to be the magnitude of force acting perpendicular to the surface area A.: The SI unit of pressure is N/m2 .This unit has the official name Pascal(Pa).1 Pa = 1 A F P = Area F
- 13. Example 10-2 • Calculating pressure. The two feet of a 60- kg person cover an area of 500 cm2 . (a) Determine the pressure exerted by two the feet on the ground. (b) If the person stands on one foot, what will the pressure be under that foot? • Approach. Assume the person is at rest. Then the ground pushed up on her with a force equal to her weight mg, and exerts a force mg on the ground where her feet (or foot) contract it. • Because 1 cm2 = (10-2 m)2 = 10-4 m2
- 14. (a) The pressure on the ground exerted by the two feet is 23 2 2 /102.1 05.0 )/10()60( mNx m smxkg A mg A F P ==== (b) If the person stands on one foot, the force is still equal to the person's weight, but the area will be half as so much, so the pressure will be twice as = 2.4x103 N/m2
- 15. Practice using the formula for pressure 1. A box weighs 500N. It’s base has an area of 5 m2 . What pressure does it exert? 2. Another identical box is placed on top of the first box. What is the pressure now? 3. A snowboarder weighs 600N. The area of the snowboard is 0.5m2 . What is the pressure on the snow? Answers: 1. 100 Pa 2. 200 Pa