Please answer and explain questions 4-5. A mass slides with negligible friction

Question

Please answer and explain questions 4-5.

A mass slides with negligible friction on a circular track of 1 m radius oriented vertically. Its speed at the position shown in the figure is 3.13 m/s. At the position shown in the figure, which arrow best represents the direction of the acceleration of the mass? The acceleration of gravity is 9.8 m/s2 and no external forces act on the system. 1. The mass is traveling at a constant velocity. so it has no acceleration. Block A (60 N) and block B (40 N) are connected by a massless cord and are AT REST. Given mu s = 0.8. The friction on A is : 48 N 24 N 16 N 60 N 0 N 20 N 40 N

Explanation / Answer

a) 8 (Since g points downwards and centripetal acceleration is inward)

b) 40N (Since the tension in string is less than the maximum frictional force. So frictional force just balance the tension which is 40N)

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