14 1 Work And Power
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Work is the product of the force applied and the distance an object moves in the direction of the applied force. Power is the rate at which work is done, or the amount of work done per unit of time. It is measured in watts. James Watt defined the unit of horsepower based on the power output of a strong draft horse to provide a useful comparison for his steam engines.
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Work is defined as the transfer of energy when a force causes an object to move. Power is the rate at which work is done and is calculated by dividing the work by the time taken. Machines make work easier by changing the direction or magnitude of the applied force, allowing tasks to be completed with less exertion. They do not reduce the total amount of work done.
5 Hydraulics - work, power, energy
Work is done when a force causes an object to displace. Power is a measure of how fast work is done. Energy is the ability to do work and is measured in joules. There are different forms of energy including kinetic energy, which is the energy of motion, and potential energy, which is stored energy due to an object's position or state. The law of conservation of energy states that energy cannot be created or destroyed, only changed from one form to another. Mechanical energy includes kinetic energy, which depends on an object's mass and speed, and potential energy, such as gravitational potential energy from an object's height. Torque is the twisting force that causes rotation and is calculated using force, distance from the pivot point
Power&Summary
Power is defined as the rate of doing work or using energy, measured in watts. It is calculated by dividing the amount of work done (in joules) by the time taken (in seconds) to do that work. For example, if 100 joules of work is done in 1 second, the power is 100 watts. Work is done when a force moves an object through a distance. Energy is the potential to do work.
(3) work
1) A machine is a device that uses energy to perform work, while a simple machine transforms the direction or magnitude of force without consuming energy.
2) Work is defined as the product of the component of force in the direction of displacement and the magnitude of displacement.
3) Work transfers energy - if energy is transferred to a system, work is positive, and if energy is transferred from a system, work is negative.
work and energy class 9 physics
1. Work is done when a force causes an object to move in the direction of the force. Different types of work include positive work when force and motion are in the same direction and negative work when they are in opposite directions.
2. Energy exists in various forms and can be transferred from one object to another or changed from one form to another, but the total quantity of energy remains constant. Common forms include potential energy due to an object's position or shape and kinetic energy due to its motion.
3. The principle of conservation of energy states that the total energy in an isolated system remains constant over time. Energy can change form but cannot be created or destroyed. For example, when an object is lifted its
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24 1 the atmosphere
The atmosphere is composed primarily of nitrogen, oxygen, and other gases that surround the Earth. It protects the Earth from harmful rays from the sun while trapping heat, and provides conditions suitable for life. The atmosphere consists of four main layers - the troposphere, stratosphere, mesosphere, and thermosphere - with decreasing air pressure and density at higher altitudes. The stratosphere contains the ozone layer which absorbs UV rays.
Ch 18 4 colors
White light separates into colors when passing through a prism due to different wavelengths refracting at different angles, called dispersion. An object's color depends on both its composition and the color of light illuminating it. Primary colors are red, green, and blue, which when mixed in different amounts can create all other colors. Secondary colors are cyan, yellow, and magenta, which are combinations of two primary colors. Complimentary colors of light combine to form white light. Primary pigment colors are cyan, yellow, and magenta.
15.1 notes
The document discusses different forms of energy including kinetic energy, which depends on an object's mass and speed, and potential energy, which can be gravitational or elastic. It provides examples of calculating kinetic energy for a flying bird and gravitational potential energy for a diver. The document also categorizes the main forms of energy as mechanical, thermal, chemical, electrical, electromagnetic, and nuclear, and notes that nuclear power plants use nuclear energy to generate electricity by splitting atoms to heat water and spin turbines.
3.1 notes
The document discusses the differences between solids, liquids, and gases. Solids have a definite shape and volume, do not compress, and do not assume the shape of their container. Liquids have no definite shape but a definite volume, cannot be compressed, and assume the shape of their container. Gases have no definite shape or volume, can be compressed, and assume the shape of their container. The kinetic theory states that particles in all matter are in constant motion and the behavior of gases is due to the fast, random motion of particles which overcome attractive forces between them.
2.2 notes
Physical properties are characteristics that can be observed or measured without changing a substance's composition, and include viscosity, conductivity, malleability, hardness, melting point, boiling point, and density. These properties can be used to identify materials, determine which are best for specific uses, and separate mixtures through processes like filtration and distillation.
2.1 notes
This document classifies matter as either pure substances or mixtures. Pure substances are uniform throughout and can be elements, which contain only one type of atom, or compounds, which contain two or more elements joined together. Mixtures are not uniform and can be either heterogeneous, with noticeably different parts, or homogeneous, with evenly distributed parts. Mixtures are further classified as solutions, suspensions, or colloids based on the size of particles in the mixture.
2.2 notes
Physical properties are characteristics that can be observed or measured without changing the composition of a substance. Some key physical properties include viscosity, conductivity, malleability, hardness, melting point, boiling point, and density. Physical properties can be used to identify materials, determine which are best suited for specific uses, and separate mixtures using techniques like filtration and distillation.
1.2 notes
The document outlines the scientific method which involves making observations, conducting research to form a hypothesis, testing the hypothesis through controlled experiments and data collection, drawing a conclusion, and potentially developing a new theory. It also discusses key aspects of the scientific method including forming testable hypotheses with manipulated and responding variables, controlling outside factors, revising hypotheses not supported by evidence, and how scientific laws summarize patterns in nature while theories aim to explain them. Scientific models are also mentioned as tools to visualize complex concepts.
How to make a good graph
To make a good graph, include a title, labels for the axes, and consistent scales. The x-axis should include the independent variable like time, while the y-axis includes the dependent variable measured. Data points can be connected with a smooth curve to show patterns, and less ink allows easier readability. Key details like calculations or uncertainties should be indicated on the graph as needed.
1.3 notes
Scientific notation and SI units are used in measurement to help scientists communicate measurements clearly across countries. The basic SI units include meters, kilograms, seconds, amperes, moles, candelas, and kelvins. Derived units are calculated from the basic units, such as newtons from kilograms and meters/seconds. SI prefixes modify the scale of units, from centi to giga. The precision of calculations is limited by the measurement with the fewest significant figures. Temperature in kelvins is calculated by adding 273 to degrees Celsius.
1.2 notes
The document outlines the scientific method which involves making observations, conducting research to form a hypothesis, testing the hypothesis through controlled experiments and data collection, drawing a conclusion, and potentially developing a new theory. It also discusses key aspects of the scientific method including forming testable hypotheses with manipulated and responding variables, controlling outside factors, revising hypotheses not supported by evidence, and how scientific laws summarize patterns in nature while theories aim to explain them and cannot be proven. Scientific models are also mentioned as helping visualize complex concepts.
Ch 26-1 The sun
The document summarizes key aspects of energy from the sun and its atmospheric features. The sun's energy comes from nuclear fusion reactions in its core that convert hydrogen into helium. This outward pressure is balanced by the sun's inward gravitational force, maintaining stability. The sun's atmosphere has three layers - the visible photosphere, the middle chromosphere, and the outer corona containing hot gases that flow out as solar winds. Sunspots, prominences, and solar flares are prominent atmospheric features.
Groups of stars 26.4
Star systems consist of two or more stars held together by gravity, with over half of all stars existing in systems. Star clusters form when stars are born together in the same nebula, allowing their ages to be determined. The three types of star clusters are open clusters, associations, and globular clusters. Galaxies are classified into four main categories: spiral, barred-spiral, elliptical, and irregular galaxies, which can be distinguished by their shapes, presence of spiral arms, and stages of star formation.
Ch 26 2 characteristics of stars
Stars have common characteristics including size, mass, color, temperature, and brightness. Size ranges from neutron stars the size of a city to supergiant stars 1000 times the size of the sun. Composition is primarily hydrogen and helium. Color indicates surface temperature from red stars at 3,000 K to blue-white stars at 50,000 K. Brightness depends on size, temperature, and distance from Earth. The Hertzsprung-Russell diagram shows the relationship between absolute magnitude and surface temperature for stars.
Ch 24 2
The document discusses the Earth's rotation and revolution and how they cause day/night and seasons. The Earth rotates on its axis over 24 hours, causing day and night. It revolves around the sun over 365.25 days, causing the seasons. The tilt of the Earth's 23.5 degree tilted axis relative to the sun as it orbits results in the sun being closer to the north or south tropic line during different parts of the year, bringing our summer and winter. Solstices occur when the sun is directly overhead the tropic lines, with the longest and shortest days of the year, and equinoxes occur when the sun is directly above the equator.
Ch 24 3 solar energy & wind
The document discusses different sources of renewable energy and atmospheric winds. It explains that solar energy comes from the sun and can be reflected, absorbed by the atmosphere or Earth's surface. Energy is transferred through radiation, convection and conduction. Winds are caused by differences in air pressure and temperature, and include local sea and land breezes as well as global winds like prevailing winds and monsoons, which are large-scale variations of land and sea breezes between seasons.
Weather patterns 24 5
The document discusses different weather phenomena including air masses, fronts, storms, and weather prediction. It defines air masses as large bodies of air with uniform temperature and moisture properties that can cover large portions of continents. Fronts occur at the boundaries between different air masses. Storms include thunderstorms with thunder and lightning, tornadoes, and hurricanes. Weather forecasting uses tools like Doppler radar, weather stations, and computers to analyze data and predict weather patterns and conditions.
23 3 water shapes the land
Water shapes the land through various erosion processes including sediment deposition, water erosion, groundwater erosion, and glacial erosion. Sediment is washed away by streams and rivers and deposited elsewhere, building up landforms like deltas. Groundwater seeps through cracks and pores in rock, dissolving soft stone and leaving behind caves, sinkholes, and stalactites. Glaciers pick up and redistribute sediment as they advance and retreat.
Ch 23-2 Weathering
Erosion is the process that wears down and transports rock and soil, shaping the Earth's surface through forces like streams, glaciers, wind, and waves. Weathering is the breakdown of rocks through chemical and physical processes like acid rain and frost wedging. Mechanical weathering physically breaks rocks through abrasion and plant roots prying rocks apart, while chemical weathering uses chemical reactions to break the bonds between minerals in rocks.
23 5 Oceans
Oceans are composed of saltwater with varying salinity levels. The continental shelf is a shallow, sloping plain along coastlines that transitions into a continual slope further from shore, cut through in places by trenches. Pressure increases and light and temperature decrease with depth in the ocean, while surface currents are driven by wind patterns and deep currents are caused by density differences in water. Waves erode coastlines through hydraulic action and abrasion, carrying sediment that is deposited to form beaches through longshore drift.
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14 1 Work And Power
- 1. 14.1 Work and Power When Does a Force Do Work? How Are Work and Power Related?