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A learner constructs a push toy using two blocks with masses 1,5 kg and 3 kg respectively. The blocks are connected by a massless, inextensible cord.
The learner then applies a force of 25 N at an angle of 30o to the 1,5 kg block by means of a light rigid rod, causing the toy to move across a flat, rough, horizontal surface, as shown in the diagram below.
The coefficient of kinetic friction (ยตk) between the surface and each block is 0,15.
2.1 State Newton’s Second Law of Motion in words. (2)
2.2 Calculate the magnitude of the kinetic frictional force acting on the 3 kg block. (3)
2.3 Draw a labelled free-body diagram showing ALL the forces acting on the 1,5 kg block. (5)
2.4 Calculate the magnitude of the:
2.4.1 Kinetic frictional force acting on the 1,5 kg block (3)
2.4.2 Tension in the cord connecting the two blocks (5)
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