A small block of mass m slides along a smooth frictional track as shown in the figure. If it starts from rest at P , what is the resultant force acting on it at Q ?

Question

A small block of mass m slides along a smooth frictional track as shown in the figure. If it starts from rest at P , what is the resultant force acting on it at Q ?, 70 mg, 60 mg, 75 mg, 65 mg

MARKS App · Accepted Answer

From energy conservation, M g 4 R = 1 2 m v 2 ⇒ v = 8 R g At θ , N = m v 2 R ⇒ N = m R × 8 g R = 8 m g So net force at θ , F n e t = N 2 + m g 2 = 65 m g

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