Work,energy and power
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![WORK
Work done means a body displaced along
the same direction of applied force.
Simply work is the product of force and
displacement.
W=Fd
Unit = joule(J)
Dimension= [ML2T-2]](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)
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Work, energy and power
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3) These equations allow calculating the unknown velocities if the masses of the bodies and their velocities before collision are known.
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This document provides information about physics concepts related to work. It defines work using the formula Work = Force x Distance, and explains this definition in examples of Atlas holding up the Earth and a waiter carrying a tray. It then discusses kinetic energy and the work-energy theorem. Examples are provided for work done by gravity over a change in height, gravitational potential energy, conservation of energy, free fall, pendulums, roller coasters, springs, and multiple forces. Power is also defined and examples using kilowatt-hours are given. The document concludes with multiple choice questions testing understanding of these concepts.
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Work is done when a body is displaced under the action of a force. Work (W) is equal to the product of force (F) and displacement (s). Work done against gravity is equal to mass (m) times gravitational acceleration (g) times height (h), or mgh. There are three types of work: positive work when displacement is in the direction of force, negative work when displacement is opposite the direction of force, and zero work when there is no displacement. Energy is the ability to do work and can exist in different forms such as mechanical, heat, and electrical energy. Mechanical energy includes kinetic energy, which is the energy of motion and equals 1/2mv^2, and potential energy
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A body which has the capacity to do work is said to possess energy.
For example , water in a reservoir is said to possesses energy as it could be used to drive a turbine lower down the valley. There are many forms of energy e.g. electrical, chemical heat, nuclear, mechanical etc.
The SI units are the same as those for work, Joules J.
In this module only purely mechanical energy will be considered. This may be of two kinds, potential and kinetic.
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Power is the rate at which work is done, or the rate at which energy is used transferred.
Equation 3.6
The SI unit for power is the watt W.
A power of 1W means that work is being done at the rate of 1J/s.
Larger units for power are the kilowatt kW (1kW = 1000 W = 103 W) and
the megawatt MW (1 MW = 1000000 W = 106 W).
If work is being done by a machine moving at speed v against a constant force, or resistance, F, then since work doe is force times distance, work done per second is Fv, which is the same as power.
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A body which has the capacity to do work is said to possess energy.
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Equation 3.6
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A power of 1W means that work is being done at the rate of 1J/s.
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the megawatt MW (1 MW = 1000000 W = 106 W).
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The document defines key physics concepts related to work, energy, and power:
1) Work is the product of the force applied and the distance an object is displaced in the direction of the force. Work is measured in joules and can be positive, negative, or zero depending on the angle between the force and displacement.
2) Kinetic energy is the energy of an object due to its motion, calculated as one-half mass times velocity squared. Potential energy is stored energy due to an object's position in a force field, calculated as mass times gravitational field strength times height.
3) Power is defined as the rate at which work is done and is measured in watts, with one watt
2.3 work, energy & power 2017
1) Work is done when a constant force acts upon an object, causing its kinetic energy to change. Work can be calculated as the product of the force and displacement (W=Fs).
2) Kinetic energy is defined as half the mass of an object multiplied by its velocity squared (Ek=1/2mv^2). Potential energy depends on an object's position or state and is defined as mgh for gravitational potential energy.
3) Energy is always conserved in an isolated system. As one form of energy decreases, another form increases such that the total energy remains the same. Machines can convert energy into useful work but some energy is always lost to heat.
2 work energy power to properties of liquids
1) Work is done when a force causes an object to be displaced. It is defined as the product of the force and displacement in the direction of the force. Work is a scalar quantity measured in joules.
2) Energy is the ability to do work and exists in kinetic and potential forms. Kinetic energy is the energy of motion and potential energy is stored energy due to an object's position or state.
3) According to the work-energy theorem, the work done on an object equals its change in kinetic energy. For a variable force, the work is calculated as the area under the force-displacement graph.
2 work energy power to properties of liquids
Work is done when a force causes an object to be displaced. Work is defined as the product of the force and displacement in the direction of the force. Kinetic energy is the energy an object possesses due to its motion. Potential energy is the energy an object possesses due to its position or state. The law of conservation of energy states that energy cannot be created or destroyed, only changed from one form to another. Elastic collisions are collisions where both momentum and kinetic energy are conserved, while inelastic collisions conserve momentum but not kinetic energy.
IIT JEE NOTES work, energy and power BY ANURAG TYAGI CLASSES
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Work ,energy and power
(1) The document discusses different types of energy including kinetic energy, potential energy, and mechanical energy. Mechanical energy is defined as the sum of kinetic and potential energy.
(2) Work is defined as force multiplied by displacement. Work done by a constant force is positive when force acts in the direction of motion and negative when opposite. Potential energy is the energy an object possesses due to its position or state.
(3) Gravitational potential energy near the earth's surface is defined as mgh, where m is the object's mass, g is acceleration due to gravity, and h is the height above a reference level. Gravitational potential energy converts to kinetic energy as an object falls.
Work
1) Work is defined as a force acting upon an object to cause displacement and is expressed as the product of force and displacement in the direction of force.
2) The work done on a body depends on the magnitude of the force and the displacement through which the body moves in the direction of force.
3) As the angle between the direction of force and motion of the body increases, less work is done along the direction of motion since less of the force is acting in that direction.
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Work,energy and power
- 1. WORK, ENERGY AND POWER KRISHNA PRIYA T V PHYSICAL SCIENCE Roll.No:32 Reg.No:DD16EDPS02
- 2. WORK Work done means a body displaced along the same direction of applied force. Simply work is the product of force and displacement. W=Fd Unit = joule(J) Dimension= [ML2T-2]
- 4. TYPES OF WORK Positive work Zero work Negative work
- 6. Work Done by a Constant Force y
- 7. Work Done by a Non-Constant Force
- 8. Work Done by a Continuously Varying Force
- 9. Force The average force times the distance gives the work. This is the same as the area under the curve. Distance Work done by a variable force The area under a force-distance curve is the work, W.
- 10. Conservative & Non- conservative force Conservative force depend initial and final point of motion. ie, does not depend travelling path. Eg: Gravitational force Non- Conservative forces are path depending force. Eg: Frictional force
- 11. Work = change in KE This is called: the Work-Energy Theorem W= ΔK
- 12. Mechanical Energy Kinetic Energy Potential Energy
- 13. Kinetic Energy K = ½ m V2 Energy possessed by virtue of its motion.
- 14. Potential Energy mg h PEmghW hxmgFxFW 10cos,0 ;cos It is the energy possessed by virtue of its configuration or position.
- 15. Work done by a spring Relaxed Position F=0 F x I compress the spring (I do + work; spring does -work) Work done by spring = - change in ½kx2
- 16. Force Distance X F-x Graph Area of triangle=F x= ½kx2 Area under F-x graph of a spring= Its potential energy
- 17. h x (h-x) Principle of Conservation of Energy A B C At point A V=mgh& K= 0& TE= mgh At point B V=mg(h-x)& K= mgx& TE=mgh At point C V=0& K=mgh& TE= mgh
- 18. POWER Rate of work with respect to time. P= W/t= F.V SI unit= watt (W) 1 W = 1 J/S Dimension= [ML2T-3]
- 19. 1hp = 746W Horse Power
- 20. Thank you…