Angular

A gymnast tucks her head and knees when starting a flip. It

• Increases her linear velocity

• Decreases her angular velocity

• Increases her moment of inertia

• Decreases her moment of inertia

The moment of inertia 'I' :

• is synonymous with mass

• does not depend on where the mass is located

• is the resistance to a change in an object's rotational speed based on its mass and the distribution of that mass

• the more resistance to change in rotational speed = less inertia

What happens to his rotational inertia, also called the moment of inertia, when a figure skater brings in his arms?

• Increase her rotational inertia

• Decrease her rotational inertia

• has no affect

A disc rotates through 20 rotations in 5 seconds. If the disc starts from rest, what is the angular velocity?

• 5 rotations/s

• 100 rotations/s

• 4 rotations/s

• 10 rotations/s

How many radians make up one revolution of 360 degrees?

• π/2

• π

• 2π

• 3π/2

What does Rotational Inertia depend on?

• Mass

• Mass Distribution

• Both Mass and its Distribution

• Neither Mass nor its distribution

A wrench is used to tighten a nut. A 25N perpendicular force is applied 50cm away from the axis of rotation, and moves a distance of 10 cm as it turns. What is the torque applied to the wrench?

• 10.0 Nm

• 12.5 Nm

• 750 Nm

• 150 Nm

When an object is experiencing a net torque

• it is in dynamic equilibrium.

• it is in static equilibrium.

• it is rotating.

• it is translating.

Which of the pistons in the image produces more torque?

• Short Stroke

• Long Stroke

• Square

• They are al the same torque

Tags

NGSS.MS-PS2-1

NGSS.MS-PS2-2

NGSS.MS-ETS1-2

NGSS.MS-ETS1-3

Why are these soldiers using a cheater pipe/bar?

• It increases the torque by increasing the radius.

• It decreases the torque by increasing the radius.

• It increases the torque by decreasing the radius.

• It's fun and cool to cheat.