Calculate the net work done by the force of friction

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Q. A weightlifter lifts a weight of mass 50.0 kg through a distance of 0.680 m, then lowers it gently. He does this 27 times. Calculate the net work done by the force of friction due to the rope rubbing on the support Ff = 135 N). Assume that friction is the only non-conservative force acting.

Q. A 1.50 m-long, 530 g rope pulls a 7.00 kg block of ice across a horizontal, frictionless surface. The block accelerates at 1.90 {rm m}/{rm s}^{2}. How much force pulls forward on (a) the ice (b) the rope?

Reference no: EM1357529

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