Question 2

An 8-kg block, on a rough horizontal surface, is connected to a 2-kg block by a light
inextensible string passing over a frictionless pulley, as shown below. The 8-kg block
moves at a constant speed when pulled by a 29,6 N horizontal force to the right.
The frictional force acting on the 8-kg block is 10 N.

2.1 State Newton’s Second Law of Motion in words. (2)
2.2 Draw a labelled free-body diagram for the 8-kg block. (5)
2.3 Calculate the tension in the string. (3)
The 29,6 N horizontal force is now increased to 50 N.
2.4 Apply Newton’s Second Law to EACH block and calculate the:
2.4.1 Magnitude of the acceleration of the 8-kg block (5)
2.4.2 Tension in the string (2)

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