SaraNextGen Study App [2022-23]
Last Updated On 23-10-2022 - By Sara

In the figure shown, a small ball of mass ‘ ’ can move without sliding in a fixed semicircular track of radius  in a vertical plane. It is released from the top. The resultant force on the ball at the lowest point of the track is

a)

b)

c)

d)

Zero


Question ID - 100178 :-

In the figure shown, a small ball of mass ‘ ’ can move without sliding in a fixed semicircular track of radius  in a vertical plane. It is released from the top. The resultant force on the ball at the lowest point of the track is

a)

b)

c)

d)

Zero

1 Answer
5876 Votes
3537

Answer Key : (a) -

(a)

From conservation of energy, the kinetic energy of the ball at the lowest point is ( speed of centre of ball)

or

Since the net tangential force on the sphere at the lowest point is zero, the net force on the sphere at the lowest position is

 upwards



Next Question :

A solid sphere of mass , radius  and having moment of inertia about an axis passing through the centre of mass as I, is recast into a disc of thickness , whose moment of inertia about an axis passing through its edge and perpendicular to its plane remains I. Then, radius of the disc will be

a)

b)

c)

d)


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