ROTATIONAL MOTION

Angular momentum is conserved in which of the following systems?

• System with external force
• System with external torque
• Isolated system with no external torque
• System with friction

Rotational kinetic energy is directly proportional to which of the following?

• Angular speed
• Square of angular speed
• Moment of inertia only
• Mass only

Which object has greater rotational inertia: a ring or a disk of same mass and radius?

• Disk
• Ring
• Both same
• Depends on thickness

A solid sphere and a solid cylinder of same mass and radius roll down an incline from rest. Which reaches the bottom first?

• Solid cylinder
• Both same
• Solid sphere
• Depends on height

If the mass of a rotating object is doubled without changing radius, what happens to moment of inertia?

• Halves
• Doubles
• Quadruples
• Remains same