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Physics P1

•Section A

7 marks

A block of mass m rests on a rough horizontal surface. A constant horizontal force F is applied. The coefficient of kinetic friction is μ.

Draw a clearly labelled free–body diagram for the block while it moves. (3)
Using Newton's second law, derive the acceleration in terms of F, m, and μ. (4)

Marking guide: Method marks for correct force diagram; application of ΣF = ma and friction model f = μmg.

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