# wed march 26 - whats the sign of K? The kinetic energy...

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1 Physics 2211 Wednesday March 26 th Work and Kinetic Energy (11.1-11.2) PRS ∆K=W is called the… Work-Energy Theorem ∆K=∆(1/2mv^2) = the difference between the final and initial kinetic energy PRS Cart A and B are on a table connected by pulley on the corner of a table. Cart B is hanging off the table. What forces are acting along cart A as it moves along the table? Weight, Tension, Normal Force PRS In the same situation, what is the sign of work that each force does on the cart? Weight=0 Tension=positive Normal Force=0 PRS In the same situation, when cart A is released, what is the sign of the net work done on the cart? Positive PRS In the same situation, the cart A is pushed in a direction away from the pulley. What happens to the kinetic energy of the cart as it moves along the track, and

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Unformatted text preview: whats the sign of K? The kinetic energy decreases, so K is negative PRS 2 In the same situation as above, what are the signs of the work that each force does on the cart? Work from weight=0, work from tension=negative, work from normal force=0 PRS In same situation as above, what is the sign of the net work on the cart? Negative PRS A ball is allowed to roll down a ramp from rest. What happens to the kinetic energy as it rolls down the ramp and what is the sign of K? Kinetic energy increases, so K is positive PRS In the same situation, what forces are on the ball as it rolls down the ramp? Weight, Normal Force, Friction...
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## This note was uploaded on 04/07/2008 for the course PHYSICS 2211 taught by Professor Uzer during the Spring '08 term at Georgia Institute of Technology.

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wed march 26 - whats the sign of K? The kinetic energy...

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