1.

A sphere of mass m is given some angular velocity about a horizontal axis through its centre, and gently placed on a plank of mass m. The coefficient of friction between the two is μ. The plank rests on a smooth horizontal surface. The initial acceleration of the sphere relative to the plank will be(a) zero(b) μg (c) 7/5 μg (d) 2μg

Answer»

Correct Answer is: (d) 2μg

The only horizontal forces acting on the two bodies are those due to friction of magnitude μmg each, in opposite directions. Hence, they have accelerations μg each, in opposite directions.



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