ROTATIONAL MOTION

What determines the resistance of a body to angular acceleration?

• Linear momentum
• Moment of inertia
• Gravitational force
• Centripetal force

Why is a flywheel designed with a large moment of inertia?

• To reduce the total weight of the engine
• To increase the temperature of the system
• To resist sudden changes in rotational speed
• To decrease friction in the system

Which of the following best defines the radius of gyration of a body?

• The average distance of all particles from the axis
• The radius of the smallest sphere enclosing the body
• The distance from the axis where the total mass could be concentrated to give the same moment of inertia
• The distance between the center of mass and the axis

What is the moment of inertia of a thin ring about an axis passing through its center and perpendicular to its plane?

• ½ MR²
• MR²
• ⅓ MR²
• ¼ MR²

For a circular disc rotating about its diameter, what is the radius of gyration?

• R
• R/√2
• R/2
• 2R