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A 120 kg crate is dragged along the horizontal ground by a 200 N force acting at an angle of 30° to tswhe horizontal. The crate moves along the surface with a constant velocity of 0.5 m s–1. The 200 N force is applied for a time of 16 s.
a Calculate the work done on the crate by:
i the 200 N force
ii the weight of the crate
iii the normal contact force R.
b Calculate the rate of work done against the frictional force FR.
Are these answers correct and is it from past papers ?
ai 200cos(30) * 8 J
aii 120*9.81 N
aiii 120*9.81 - 200sin(30) N
b 1600 cos(30) / 16 W