Angular Kinematics

A ball attached to a string and rotates in a circle. If it takes 1.00 s to complete one revolution, what is the angular velocity of the ball?

• 3.14 rad/s
• 6.28 rad/s
• 9.42 rad/s
• 12.6 rad/s

Units for angular velocity

• radians

• rad/s

• rad/s²

• m/s

A rod rotates about a pivot at its center with a known initial angular velocity and eventually comes to rest. What quantities could you measure to determine the angular acceleration of the rod?

• The time it takes the rod to stop turning

• The number of rotations the rod completes while coming to rest

• the friction between the rod and the axle it is mounted on

• the weight of the rod

A record on a turntable is spinning and is coming to rest. If the angular velocity is 20.0 rad/s and the record slows at a rate of - 5 rad/s/s, how long does it take the record to come to rest? 

• 2 s
• 4 s
• 12 s 
• 8 s 

Which of the following is the unit for angular displacement?

• meters
• seconds
• radians
• radians per second

Units for angular acceleration

• radians
• rad/s/s
• m/s/s
• m/s

When a rigid object rotates about a fixed axis, what is true about all the points in the object? 

• They all have the same tangential acceleration.
• They all have the same angular speed.
• They all have the same tangential speed.
• They all have the same radial acceleration.

This symbol represents

• torque

• tacos

• tangential velocity

• tension

This symbol represents

• angular displacement

• angular velocity

• angular acceleration

• angular momentum

This symbol represents

• angular displacement

• angular velocity

• angular acceleration

• angular momentum