ROTATIONAL MOTION

What is the condition for translational equilibrium in a coplanar force system?

• Only the x-component of forces must sum to zero
• Only the y-component of forces must sum to zero
• The sum of the components of forces along any two perpendicular axes must be zero
• The sum of torques must be zero

What happens to the net torque when two equal parallel forces act in the same direction on a rod at its ends?

• Net torque is doubled
• Net torque causes clockwise rotation
• The net torque is zero because the individual torques cancel each other
• Net torque increases linearly

How does the application of a couple differ from a single net force?

• Both produce only translation
• Both produce only rotation
• A couple causes translation, and a net force causes rotation
• A couple causes rotation without translation, while a net force causes translation

What is the primary effect of a couple on a rigid body?

• It produces translation without rotation
• It prevents all motion
• It increases the mass of the body
• It produces rotation without translation

When is a body said to be in partial equilibrium?

• When it is moving with constant velocity
• When it is accelerating uniformly
• When it is in static equilibrium
• When it is in either translational or rotational equilibrium, but not both