Work & Power Practice Questions (This works best as flash cards!)
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5 Terms
A deflated hot-air balloon weighs a total of 8000 N. Filled with hot air, the balloon rises to a height of 1000 m. How much work is accomplished by the hot air?
8000 N x 1000 m = 8,000,000 J
A rope is thrown over a beam, and one end is tied to a bundle of lumber. You pull the free end of the rope 2 m with a force of 400 N to lift the lumber off the ground. How much work have you done?
400 N x 2 m = 800 J
A battery uses 900 J of energy to run a radio for 150 seconds. What is the power of the radio?
900 J ÷ 150 s = 6 W
A chainsaw is cutting a piece of lumber for 180 seconds. If 200 watts of power is used, how much work is performed?
200 W x 180 s = 36,000 J
Tommy does 15 Joules of work to push the pencil over 2 meters. How much force did he use?
15 J ÷ 2 m = 7.5 N