Rotation in AP Physics C: Mechanics
Which quantity measures how much an object resists change in its rotational speed?
Rotational kinetic energy
Moment of inertia
Angular velocity
Centripetal acceleration
Given that rolling friction can be considered negligible, what would happen to rotational kinetic energy when an initially rolling cylinder transitions onto a surface with double coefficient of static friction but still rolls without slipping?
Rotational kinetic energy drops due to increased resistance from static friction.
Rotational kinetic energy remains unchanged because there is no slipping or work done by rolling friction.
Rotational kinetic energy is lost as heat due to increased frictional forces.
Rotational kinetic energy doubles since more friction increases energy transfer to rotational motion.
If you push on a door at its edge with the same force as pushing at its middle, where would the door rotate faster?
Pushing at either point results in the same rotational speed because only torque matters, not point of application.
The door won't rotate regardless of where you push because forces cancel out.
Pushing at its middle makes the door rotate faster since it’s closer to the axis of rotation.
Pushing at its edge makes the door rotate faster due to more torque.
A figure skater pulls her arms inward during a spin; what happens to her rotational speed?
It decreases.
It fluctuates due to changes in air resistance as she spins faster or slower.
It remains unchanged because her total energy is conserved.
It increases.
How might one design an experiment that tests for variations in kinetic energy due specifically to changes in an object's moment of inertia while maintaining constant linear velocity?
Swinging various flywheels with adjustable mass radii at fixed speeds using controlled bursts from a linear actuator then measuring their rotational kinetic energy.
Launching projectiles at different angles and calculating their maximum heights reached using kinematic equations.
Colliding carts with magnets installed frontally where only one cart's mass varies each trial, observing post-collision velocities.
Dropping balls into sand from consistent heights but altering ball diameters each trial, examining penetration depths upon impact.
What happens maximum angular velocity spinning disk before breaks apart assuming uniform density throughout entire object?
Incorrect answer
Incorrect answer
Incorrect answer
Incorrect answer
If a solid disk and a hollow cylinder are released from rest at the top of an inclined plane, which object reaches the bottom first assuming no slippage occurs?
The solid disk.
It depends on the angle of incline.
The hollow cylinder.
They reach the bottom at the same time.

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What unit is used to measure impulse in the International System of Units (SI)?
Kilogram-meter per second squared (kg·m/s²)
Watt-second (W·s)
Joule-second (J·s)
Newton-second (N·s)
Which quantity measures an object’s resistance to changes in rotational motion?
Moment of inertia.
Centripetal force.
Angular momentum.
Torque.
Which variable remains constant for a rigid body rotating around a fixed axis without any outside torques applied?
Torque
Momentum
Angular momentum
Angular acceleration