Practice Review

You are making a circular turn in your car on a horizontal road when you hit a big patch of ice, causing the force of friction between the tires and the road to become zero. While the car is on the ice, it

• continues to follow a circular path, but with a radius larger than the original radius.
• moves along a straight-line path toward the center of the circle.
• moves along a straight-line path away from the center of the circle
• moves along a straight-line path in its original direction.

When a car goes around a circular curve on a horizontal road at constant speed, what force causes it to follow the circular path?

• the normal force from the road
• gravity
• the friction force from the road
• No force causes the car to do this because the car is traveling at constant speed and therefore has no acceleration.

If a coin is rotating clockwise in a circular path on a turntable, which of the following is true?

• when the coin is at the top of the turntable, the acceleration is pointing to the left
• when the coin is at the bottom of the turntable the velocity points towards the center.
• the force keeping the coin in place is the weight of the coin pointing towards the center
• the acceleration of the coin is caused by a frictional force pointing towards the center 

Categorize something that is measured in radians per second

• Linear Distance

• Angular Distance

• Linear Speed

• Angular Speed

Categorize something that is measured in degrees

• Linear Distance

• Angular Displacement

• Linear Speed

• Angular Speed

360 degrees in radians is

• 3.14

Jeep wrangler factory tires have a radius of .38 m and off-roading tires have a .43 m radius. If both vehicles have an angular velocity of 150 rad/s what are the linear speed for each tire?

• 57 m/s

• 65 m/s

• 698 m/s

• 349 m/s

A bicycle wheel with diameter .43 m rotates at 3 revolutions per second. What is the the linear velocity? (round to tenths)

• 8.1 m/s

• 8.2 m/s

• 8.3 m/s

• 8.4 m/s

Calculate the angular velocity of a car tire with a radius of .31m traveling a speed of 22 m/s

• 71 rad/s

• 72 rad/s

• 73 rad/s

• 75 rad/s

What are the units for angular displacement.

• m/s

• kgm2/s

• radians

• rad/s