Question Detail

PHY 101 Mechanical Equilibrium and Rotational Dynamics Objective Question
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Question

Which of the following statements best describes the condition for a body to be in rotational equilibrium?
Options
A The centre of mass of the body has zero acceleration.
B The vector sum of all external forces acting on the body is zero.
C The net torque acting on the body must be zero.
Correct Answer
D The body must be at rest.
Correct Answer

Option C is the correct answer.

Detailed Explanation

Rotational equilibrium specifically refers to the absence of any tendency for the body to rotate. This condition is mathematically expressed as the net torque acting on the body being zero. While a body at rest is often in rotational equilibrium, it can also be rotating with constant angular velocity and still be in rotational equilibrium as long as the net torque is zero.

Hint

Distinguish between the conditions for translational equilibrium (no net force) and rotational equilibrium (no net torque).

Question Info

Course: PHY 101
Topic: Mechanical Equilibrium and Rotational Dynamics
Type: Objective
Difficulty: Not specified
Question 559 of 1250
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