The following questions refer to this situation: A 1 kg object is moved part way

Question

The following questions refer to this situation: A 1 kg object is moved part way around a square loop oriented vertically, as shown, either by the black arrows or by the red arrow from the start point to the finish point. The square is 1m on a side. Ignore the time at the corners when the block is changing direction.

a. You move along the red arrow?, starting from rest and ending at a downward velocity of 50 cm/s. This process takes 2.0 seconds. What is the net work done on the object?? Assume constant acceleration.

b. In the last part, what is the net work done on the earth by the object?

Explanation / Answer

given mass of boject m = 1 Kg

square length l = 1 m

a) from start to finish point distance traveled is 0.5 m as it moves downward the gravitational force on it is

equal to the work done on the object

that is W = mgh = 1*9.8*0.5 = 4.9 J

b) Net work done on the earth by object is zero, means the earth not displacing so    W = F.s Cos theta = 0 J

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