11-A-Pre: Rolling and Angular Momentum

What is happening to the ice skater?

• Decreased Angular velocity, decreased rotational inertia

• Decreased Angular velocity, increased rotational inertia

• Increased Angular velocity, increased rotational inertia

• Increased Angular velocity, decreased rotational inertia

Tags

NGSS.HS-PS2-1

Sphere rolls from rest down an inclined plane. 

• B
• C
• D
• E

Tags

NGSS.HS-PS2-1

NGSS.HS-PS3-1

Which of these items is easier to turn?

• Left

• Right

• Both are just as easy to turn

Find the angular momentum for a 5 kg solid cylinder with a 20 cm radius rotating at 3 rad/s.

• 3000 kg-m²/sec

• 0,3 kg-m²/sec

• 0,6 kg-m²/sec

• 1.2 kg-m²/sec

A particle with 1 kg of mass, travels in a circular path of 0.5 m radius, giving 20 revolutions per second. Its angular momentum is ...

• 62.8 kg-m²/sec

• 31.4 kg-m²/sec

• 15.7 kg-m²/sec

Which has greater angular speed, 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 speed

Which would have a greater linear velocity?

• Kid near the center of the merry go round
• Kid near the outside of the merry go round
• neither

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

In order to do a lot of flips an Olympic diver would want:

• A high rotational inertia
• A low rotational inertia
• A low linear acceleration
• A low angular velocity

Stars originate as large bodies of slowly rotating gas. Because of gravity, these clumps of gas slowly decrease in size. What happens to the angular speed of the star as it shrinks?

• It rotates faster.

• It rotates slower.

• It starts to accelerate in the forward direction.

• The rotation rate stays the same.