Rotational Motion and Torque Quiz

What is moment of inertia?

• The resistance of an object to changes in its rotational motion

• The ability of an object to maintain linear motion

• The force required to move an object

• The amount of friction in a rotating system

According to Newton's first law, what happens to a rotating object if no external torque is applied?

• It stops immediately

• It continues rotating at a constant speed

• It speeds up

• It moves in a straight line

What happens to moment of inertia when mass is distributed farther from the axis of rotation?

• It decreases

• It stays the same

• It increases

• It becomes zero

Which factor does NOT affect the moment of inertia of an object?

• Mass

• Distribution of mass

• Shape of the object

• Temperature

If a rod is extended outward, what happens to its moment of inertia?

• It decreases

• It increases

• It remains the same

• It depends on the velocity

Which shape has the largest moment of inertia when rotated about its center?

• Solid sphere

• Solid cylinder

• Hollow cylinder

• Disk

What is the equation for moment of inertia for a point mass?

• I = m + r

• I = mr²

• I = m/r

• I = m²r

What happens when two objects with different moments of inertia roll down an incline?

• The one with the smaller moment of inertia reaches the bottom first

• The heavier object always reaches the bottom first

• They reach the bottom at the same time

• The larger object rolls faster

What is torque?

• A force that opposes motion

• A measure of rotational force

• The force required to move an object in a straight line

• The change in velocity of a rotating object

How can torque be increased?

• Decreasing the force applied

• Increasing the distance from the pivot point

• Applying force at the center of mass

• Reducing friction