Per6_over - Preview of Period 6: Energy and Work 6.1 Work...

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Preview of Period 6: Energy and Work 6.1 Work and Energy How much energy is required to do work? 6.2 Potential Energy How do objects gain potential energy? How can we use their potential energy to do work? Kinetic Energy Potential Energy What happens when potential energy is converted into kinetic energy? Energy Conservation and Conversions Does the amount of energy in the Universe increase, decrease, or remain constant? 6.7 Energy Storage How is potential energy stored? 6-1
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Act. 6.1: Work and Energy Work is done when a force moves an object over some distance in the direction of the force. Work = Force x Distance W = F D W = work (joules or foot-pounds) F = force applied (newtons or pounds) D = distance moved in the direction of the force (meters or feet) Work and energy are measured in units of joules. 1 joule = 1 kg m 2 /s 2 Work is done to raise a box vertically against the force of gravity. 6-2 Work is done to move a box horizontally against the force of friction. Applied Force Applied Force Force of gravity Force of friction
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Work Done to Lift a Box Vertically The weight of an object equals the object’s mass times the acceleration of gravity (g) Weight = F = M g The work required to lift an object equals the object’s weight times the vertical distance it moves. W = M g h W = work (joules) M = mass of object (kilograms) g = acceleration of gravity = 9.8 m/s 2 h = vertical height the object moves (meters) Ignoring wasted energy, the force required to lift the box is the weight of the box. weight = Mg 6-3 h = vertical distance the center of mass of the box is raised. Applied Force Force of gravity
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Work is done when a force moves an object over some distance in the direction of the force. Work = Force x Distance Work is done to raise a box vertically against the force of gravity . Work is done to move a
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This note was uploaded on 06/11/2011 for the course PHYSICS 103 taught by Professor Staff during the Spring '10 term at Ohio State.

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Per6_over - Preview of Period 6: Energy and Work 6.1 Work...

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