NEW
Font size
WorksheetsRotational Dynamics
Total questions: 12
Worksheet time: 12mins
A rigid body is rotating about an axis. to stop the rotation, we have to apply........
pressure
force
momentum
torque
A disc of mass 2 kg and radius 20 cm is free rotate about an axis through its centre and perpendicular to the disc. If a force of 50 N is applied tangentially to the disc, then the angular acceleration is.......
250 rad/s2
25 rad/s2
2.5 rad/s2
0.25 rad/s2
A circular disc rotates about an axis passing through its center with a certain angular velocity. Suddenly a small piece of the disc breaks from the edge and falls down. Then ........
its rotational inertia will increase and the angular velocity will decrease
its rotational inertia will decrease and the angular velocity will increase
both, the rotational inertia and the angular velocity will increase
both, the rotational inertia and the angular velocity will decrease
The rotational inertia of a body does not depend on ......
the mass of the body
the angular velocity of the body
the axis of rotation of the body
the distribution of the mass of the body
An object with a rotational inertia of 5 kg-m2 rotating with an angular velocity of 6 rad/s has the same kinetic energy as a mass of 20 kg moving with a velocity of ........
12m/s
9 m/s
6 m/s
3 m/s
Which has greater angular velocity, a horse near the outside rail of a merry-go-round or a horse near the inside rail?
The inside horse
The outside horse
Neither - they both have the same angular velocity
The easiest way to open a heavy door is by applying the force
Near the hinges
In the middle of the door
At the edge of the door far from the hinges
At the top of the door
An ice skater is spinning in a circle with his arms extended out. He then brings his arms in, what happens to his rotational velocity?
It increases
It decreases
It stays the same
He stops spinning immediately
Because a hollow ball has a higher rotational inertia than a solid ball...
The solid ball rolls faster
The solid ball weighs more.
The solid ball weighs less.
They both accelerate at the same rate.
What is the total kinetic energy of a 3 kg solid disk ( I=21mR2 ) with a diameter of 80 cm rolling at 4 m/s?
12 J
24 J
36 J
48 J
The figure shows scale drawings of four objects, each of the same mass and uniform thickness, with the mass distributed uniformly. Which one has the greatest rotational inertia when rotated about an axis perpendicular to the plane of the drawing at point P?
A
B
C
D
