Mark and David are loading identical cement blocks onto David\'s pickup truck. M

Question

Mark and David are loading identical cement blocks onto David's pickup truck. Mark lifts his block straight up from the ground to the truck, whereas David slides his block up a ramp containing frictionless rollers. Which statement is true about the work done on the block-Earth system?

A) Mark does more work than David.
B) Mark and David do the same amount of work.
C) David does more work than Mark.
D) None of those statements is necessarily true because the angle of the incline is unknown.
E) None of those statements is necessarily true because the mass of one block is not given.

Explanation / Answer

The answer is B) Mark and David do the same amount of work this is because the only force being over came by both Mark and David is the vertical force of gravity because the force of friction does not exist due to the frictionless rollers. Because Work is equal to the product of force and distance, both Mark and David are lifting identical blocks against identical forces, their work is equal. educationally it can be seen as W1=F1D1 W2=F2D2 F1=F2 D1=D2 therefore W1=W2.

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