PhysNov3

PhysNov3 - November 3 Physics In If 400 Joules of work is...

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November 3 Physics

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In: If 400 Joules of work is done lifting this 10 kg box, how high did it go?
Objective : To continue our study of energy Success criteria: Be able to solve problems of: work, kinetic energy work/kinetic energy theorem gravitational potential

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Homework check
Work: Work=force x distance Force and distance must be in the same direction

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Work/Kinetic energy Theorem The work done on an object equals the change in kinetic energy of the object: Work=KE 2 -KE 1
Problem: A man lifts a 10 kg cat a distance of 2 m, how much work did he do on the cat?

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Problem: A 10 kg cat is dropped from a height of 2 m. Just before it lands, it has a speed of 6.3 m/s, what is it’s kinetic energy?
A 2000 kg car goes from 0 to 60 m/s. How much work was done? It took 100 meters to accelerate. How much force was used?

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A 2000 kg truck going 20 m/s hit a tree and crumpled .5 meters. What was the force on the tree?
Work=KE2-KE1 Fxd=0-1/2mv 2 F(.5)= -1/2(2000)20 2 F= -400,000/.5 F= -800,000 N

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A 2000 kg car goes from 0 to 60 m/s. How much work was done?
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