Rotational Inertia

Angular Momentum is the product of...

• rotational inertia and linear velocity.

• linear inertia and angular velocity.

• linear momentum and angular velocity

• rotational inertia and angular velocity.

You swing a bucket of water attached to a string in a circle above your head. What keeps the water in the bucket?

• Friction

• Centripetal Force

• Gravity

• Inertia

Tags

NGSS.MS-PS2-2

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

• high rotational inertia

• low rotational inertia

• low linear acceleration

• low angular velocity

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

A person sits on a freely spinning lab stool that has no friction in its axle. When this person extends her arms,

• her moment of inertia increases and her angular speed decreases.

• her moment of inertia decreases and her angular speed increases.

• her moment of inertia increases and her angular speed increases.

• her moment of inertia increases and her angular speed remains the same.

Which has more rotational inertia? (consider all objects have equal radius)

• Hollow sphere

• solid sphere

• cylindrical shell

• solid cylinder

Analogue of mass in rotational motion is

• moment of inertia

• radius of gyration

• torque

• angular momentum

Which of these gives rotational kinetic energy?

• a

• b

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

What happens to her moment of inertia when a figure skater brings in her arms? (angular momentum= moment of inertia X angular velocity)

• Increase her moment of inertia

• Decrease her moment of inertia

• has no effect