Rotational Motion
Physics ⇒ Mechanics
Rotational Motion starts at 11 and continues till grade 12.
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See sample questions for grade 12
A child sits at the edge of a rotating merry-go-round. If she moves towards the center, what happens to the angular velocity of the system, assuming no external torque acts?
A gymnast pulls in her arms while spinning. What happens to her angular velocity?
If a body is rotating with constant angular velocity, what is its angular acceleration?
State the perpendicular axis theorem.
State the principle of conservation of angular momentum.
State the relation between linear velocity (v) and angular velocity (ω) for a point at a distance r from the axis of rotation.
A child sits at the edge of a rotating merry-go-round. If she moves towards the center, what happens to the angular velocity of the system, assuming no external torque acts?
A ring, a disc, and a sphere, each of mass M and radius R, are rolling without slipping with the same linear velocity. Which has the greatest total kinetic energy? (1) Ring (2) Disc (3) Sphere (4) All have the same
A solid sphere and a hollow sphere of the same mass and radius are released from rest at the top of an inclined plane. Which one will reach the bottom first? (1) Solid sphere (2) Hollow sphere (3) Both together (4) Cannot be determined
Which of the following has the greatest moment of inertia for the same mass and radius? (1) Solid sphere (2) Hollow sphere (3) Solid cylinder (4) Thin ring
Which of the following is the correct expression for torque (τ) in terms of force (F) and position vector (r)? (1) τ = r × F (2) τ = F × r (3) τ = r · F (4) τ = F · r
If the angular velocity of a rotating object is doubled, its rotational kinetic energy becomes ______ times its original value.
If the net external torque acting on a system is zero, then its total angular momentum ________.
The moment of inertia of a body is minimum about an axis passing through its ________.
The moment of inertia of a thin rod of length L and mass M about an axis passing through its center and perpendicular to its length is ________.
The parallel axis theorem is used to calculate the moment of inertia about any axis parallel to the axis passing through the ________.
The radius of gyration is defined as the distance from the axis of rotation at which the entire mass of the body can be assumed to be concentrated to give the same ________ as the actual distribution.
The rotational kinetic energy of a body is given by ________.
The angular acceleration of a rotating body is always in the direction of the applied torque. (Yes/No)
True or False: The moment of inertia of a body depends on the axis of rotation chosen.
