ROTATIONAL MOTION

Why is the moment of inertia of a solid sphere less than that of a hollow sphere of same mass and radius?

• Solid sphere has more mass
• Hollow sphere has less density
• More mass is closer to the axis in solid sphere
• They have same inertia

What analogy exists between translational and rotational motion in terms of describing motion with one variable?

• Rotation in space is like 3D motion
• Rotation about fixed axis is analogous to linear motion
• Rotational motion has no analogy
• Rotation is always more complex

How does the moment of inertia of a disc compare when rotating about a diameter versus perpendicular to its plane?

• It is the same
• It is double
• It is half about the diameter
• It is four times

Which body has the same moment of inertia as a thin circular ring about its central perpendicular axis?

• Solid sphere
• Solid cylinder
• Circular disc
• Hollow cylinder

Which of the following has the highest moment of inertia for the same mass and radius?

• Solid sphere
• Solid cylinder
• Circular disc
• Hollow cylinder