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WorksheetsDynamic Rotation
Total questions: 23
Worksheet time: 39mins
Torques cause changes in _______.
velocity
moment of inertia
lever arm
angular velocity
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
If the net torque on an object is 0, then the object will
not rotate or rotate at a constant angular velocity.
rotate with a constant angular acceleration.
not rotate or move in a straight line.
not move in a straight line.
If a net torque is applied to an object, that object will experience which of the following? (A net torque means a net torque that is NOT 0!)
A constant angular speed
A constant moment of inertia
An angular acceleration
An increasing moment of inertia
At what angle should the force be applied to a wrench to produce the maximum torque?
00 to the handle
900 to the handle
1800 to the handle
3600 to the handle
Suppose a doorknob is placed at the center of a door. Compared with a door whose knob is located at the edge, what amount of force must be applied to this door to produce the torque needed to open it?
1/4 as much
1/2 as much
Twice as much
Four times as much
What must be true in order for an object to be in both translational and rotational equilibrium?
The acceleration is zero.
The angular acceleration is zero.
The acceleration and angular acceleration are zero.
The velocity and angular velocity are zero.
What is defined as a twist or turn, which causes an angular acceleration?
Angular Momentum
Center of Mass
Force
Torque
What is the measure of the resistance of an object to change its rotational motion?
Center of Mass
Moment of Inertia
Rotational Equilibrium
Torque
A skater spins with an angular velocity of 5 rad/s when her arms are extended. Her moment of inertia is 12 kg·m². When she pulls her arms in, her moment of inertia decreases to 10 kg·m². Find her new angular velocity !
(a)
A disk is with moment inertia of 1,75 kgm2 is rotating at an angular velocity of 2 rad/s. A small mass of 1 kg is placed at the edge of the disk, which has a radius of 0.5 m. What's the final angular velocity of the disk and the object ?
(a)
A 5 kg point mass is moving with velocity of 20 m/s in circular path with radius of 2 meter. Find the angular momentum of the mass about the center of the circle ? (a) kgm/s2 (answer just a number)
A solid sphere of mass 2 kg and radius 0.5 m rotates at an angular velocity 10 rad/s. Find its angular momentum! (kgm2/s) (answer just the number)
(a)
A force of 25 N is applied at an angle of 53° to a 2 m long lever arm. What is the effective torque about the pivot?
(Use sin53°=0.8)
(a)
A small solid disk of mass 2 kg and radius 0.5 m rotates at 6 rad/s around its central axis. Calculate its angular momentum. (kgm2/s)
(a)
one word for tomorrow exam
A solid sphere of mass 5 kg and radius 0.2 m is rotating at 10 rad/s. What is its moment of inertia about its central axis? (a) m2 (tulis hanya angka)
I= 52mr2
