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Question Question 2(iv)
(a) A brass ball is hanging from a stiff cotton thread. Draw a neat labelled diagram showing the forces acting on the brass ball and cotton thread.
(b) Can the couple acting on a rigid body produce translatory motion?
(a) In the figure below, the force on the ball is the weight W acting vertically downwards and the force on the thread is the tension T acting upwards.
(b) No, the couple acting on a rigid body cannot produce translatory motion, it can cause only rotatory motion as the resultant force is zero.