ROTATIONAL MOTION

How does the point of application of a force influence rotational motion?

• It changes the mass
• It affects only speed
• It determines the lever arm and hence the torque produced
• It has no effect

What is the net effect when two equal and opposite forces act along the same line on a rigid body?

• It rotates
• It translates
• The body remains in complete equilibrium
• It oscillates

Why do equal and opposite forces at the ends of a rod not always cancel rotational effects?

• Because forces are unequal
• Because the rod is asymmetric
• Because they may act in the same rotational sense about the center
• Because gravity interferes

What is the motion of a freely suspended rod when a couple acts on it?

• It moves linearly
• It remains completely at rest
• It vibrates
• It rotates about its center of mass

What determines whether a force system produces rotation in a rigid body?

• The color of the object
• The temperature
• The presence of a net torque due to unbalanced moments
• The time of day