PHYS2A Final

What does rotational inertia measure?

• The speed of rotation

• Resistance to rotational acceleration

• Total kinetic energy

• Force applied in circular motion

Which of the following factors does NOT affect rotational inertia?

• Mass of the object

• Shape of the object

• Angular velocity

• Distribution of mass

Rotational inertia is greater when mass is:

• Concentrated near the axis of rotation

• Spread out from the axis of rotation

• Equal in all directions

• Constant regardless of position

Which of the following best describes the rotational inertia of a solid disk versus a ring (same mass and radius)?

• The disk has greater rotational inertia

• The ring has greater rotational inertia

• Both have the same rotational inertia

• Depends on angular velocity

The SI unit of rotational inertia is:

• kg x m/s²

• kg x m²

• N x m

• m/s²

Which of the following expressions represents rotational inertia (I) of a point mass?

• I=1/2m x v^2

• I=m x r^2

• I=m x v^2 x r

• I=F x r

Tags

CCSS.8.EE.C.7B

For an object rotating about a fixed axis, increasing which of the following will increase the rotational inertia the most?

• Doubling the mass

• Doubling the radius

• Doubling the angular speed

• Doubling the torque

1. Rotational inertia depends on the axis of rotation because:

• 1. Gravity acts differently at different angles

• 1. The mass distribution changes with respect to the axis

• 1. Friction varies with orientation

• 1. Angular velocity remains constant

• Angular momentum is defined as:

• • Force × time

• • Torque × radius

• • Moment of inertia × angular velocity

• • Mass × acceleration

Which symbol typically represents angular momentum?

• I

• T

• M

• L