Rotational Motion
Physics ⇒ Mechanics
Rotational Motion starts at 11 and continues till grade 12.
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See sample questions for grade 11
A child sits at the edge of a rotating merry-go-round. If the child moves towards the center, what happens to the angular velocity of the system (assuming no external torque)?
A disc of moment of inertia 0.5 kg·m² is rotating at 6 rad/s. What is its angular momentum?
A flywheel of moment of inertia 0.2 kg·m² is rotating at 10 rad/s. Calculate its rotational kinetic energy.
A force of 5 N is applied perpendicular to a wrench at a distance of 0.3 m from the pivot. What is the torque produced?
A rotating object has an angular acceleration of 3 rad/s². If its initial angular velocity is 2 rad/s, what is its angular velocity after 4 seconds?
A solid cylinder of mass 5 kg and radius 0.4 m is rotating about its axis at 8 rad/s. Calculate its rotational kinetic energy.
A solid disc of mass 2 kg and radius 0.5 m rotates about its central axis. Calculate its moment of inertia.
A uniform rod of length 2 m and mass 3 kg is rotated about an axis perpendicular to its length and passing through one end. Calculate its moment of inertia.
A uniform rod of length L and mass M is rotated about an axis passing through its center and perpendicular to its length. What is its moment of inertia?
A uniform solid sphere of mass 4 kg and radius 0.2 m rotates about its diameter. Calculate its moment of inertia.
A wheel rotates through 120 radians in 10 seconds. What is its average angular velocity?
A wheel starts from rest and accelerates at 2 rad/s² for 5 seconds. What is its final angular velocity?
Define torque and write its SI unit.
Explain the law of conservation of angular momentum.
Explain why a figure skater spins faster when pulling in their arms.
If a rigid body is rotating with constant angular velocity, what is its angular acceleration?
State the parallel axis theorem.
State the perpendicular axis theorem.
The angular velocity of a rotating object changes from 4 rad/s to 10 rad/s in 3 seconds. What is its angular acceleration?
Which law states that the net external torque acting on a system is equal to the rate of change of its angular momentum?
