Unit 5 Rotational Motion Review

Horses with the greatest linear speed on a merry-go-round are located

• Near the center

• Near the outside

• anywhere, because they all move at the same speed.

Compared with a force, a torque involves

• rotation

• leverage

• distance from an axis of rotation

• all the above

Where on Earth would be the greatest rotational speed?

• the north pole

• Winnipeg, Canada

• Sioux Falls, South Dakota

• Miami, Florida

• All locations on Earth have the same rotational speed

The F_c of a 120 kg tube with a centripetal acceleration of 6.4 m/s² is

• 18.8 N

• 231 N

• 768 N

• 1,263 N

 2600 rev/min is equivalent to which of the following?

• 2600 rad/s 
• 43.3 rad/s 
• 273 rad/s
• 60 rad/s

A 0.12-m-radius grinding wheel takes 5.5 s to speed up from 2.0 rad/s to 11.0 rad/s. What is the wheel's average angular acceleration?

• 9.6 rad/s/s
• 4.8 rad/s/s
• 3.1 rad/s/s
• 1.6 rad/s/s

What happens to his rotational inertia when a figure skater brings in his arms?

• Increase his rotational inertia
• Decrease his rotational inertia
• has no affect

According to the Law of Conservation of Angular Momentum, if I (momentum of inertia) increases, what will happen to ω?

• Decrease
• Stay the same
• Increase

How do you find the tangential speed of a rotating circle?

• v = ωr
• v = ωr²
• v = ωπ
• v = ωπr

Which of the following formulas is the correct equation for the law of Universal gravitation?