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.
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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.
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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