ROTATIONAL MOTION

How many conditions must be satisfied for mechanical equilibrium when all forces acting on a rigid body are coplanar?

• One
• Two
• Three
• Four

Which of the following best describes the condition for rotational equilibrium of a rigid body?

• The vector sum of all forces must be zero.
• The sum of the forces along two perpendicular axes must be zero.
• The net displacement of the body must be zero.
• The sum of the components of the torques along any axis perpendicular to the plane of the forces must be zero.

What is the condition for rotational equilibrium in two dimensions?

• All torques are zero
• Only one torque acts
• The sum of clockwise torques equals the sum of counterclockwise torques
• Torques add to infinity

How does the torque due to a force change if the force is doubled and the distance is halved?

• It doubles
• It halves
• It remains the same
• It quadruples

What happens to the angular momentum of a spinning ice skater when they extend their arms?

• It increases
• It decreases
• It remains constant
• It reverses