Ram is pushing a block from right with a constant force F. Rajat starts pushing from left with 0 force but keeps increasing his force uniformly. Anser the following giving reasons :
(i) What is the direction of friction currently ?
(ii) Will the direction of friction ever change ? [5 MARKS]

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Solution

Part i : 2 Marks
Part ii : 3 Marks

(i) Direction of friction is towards right as the net force is towards the left and that is because initially to a time, t Ram will be applying a greater force than Rajat.

(ii) Yes, the direction of friction will change when the body stops and reverses the direction of motion and that will happen after that time, t when Rajat will be applying a greater force than Ram. In that case, the net force will be towards right. So, friction will be towards left.

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