Question

A smooth cone is rotated with an angular velocity $\omega$ as shown. A block A is placed at height h. A block has no motion relative to cone. Choose the correct options, when $\omega$ is increased.

• A. net foree acting on block will increase
• B. normal reaction acting on block will increase
• C. h will increase
• D. normal reaction will remain unchanged

Answer 1

Answer: (A), (B)

The correct options are
A normal reaction acting on block will increase
B net foree acting on block will increase

A and B: When $\omega$ is increased, Normal reaction and hence the net force on block A increases. Hence, A and B are correct.

C: h would not change as the cone is smooth and there will not be any motion along its surface. Hence, C is incorrect.

D: Normal reaction would increase. Hence, D is incorrect.