a)Draw a free body diagram for an object of mass 15kg in free fall near the surf

Question

a)Draw a free body diagram for an object of mass 15kg in free fall near the surface of earth. Label all forces. The work done by a force F on an object traveling a distance s is given by W=Fscos(angle). The (angle) is the angle between F and s. What is the angle between F and s for the falling object? Calculate the work done on this object by F after it has fallen a distance of 6.8m.

b) If you observed any discrepancies between your two anserrs (i.e. between W=deltaKE= KEf -KEo and W=FLcos(angle)), explain where they might have come from. Did you calculatye your theoretical work to be greater or less than your actual work? If you calculated your actual work to be less than your theoretical work, what might have caused this discrepancy?

Explanation / Answer

a) angle =0 W =mgh =15*9.8*6.8 =999.6 N b)the los energy might be due to the air resistance acting on the body...here we neglect it and calculated the workdone

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