ROTATIONAL MOTION

How is torque related to angular acceleration in rotational motion?

• τ = I/α
• τ = α/I
• τ = I²α
• τ = Iα

What happens to mechanical energy in pure rolling on a smooth incline?

• It is lost as heat
• It increases
• It oscillates
• It is conserved

What is the condition for pure rolling motion?

• Slipping occurs
• Only translation happens
• Only rotation happens
• No slipping at the point of contact

How does rotational kinetic energy of a rigid body compare to translational kinetic energy?

• Rotational KE = mv
• Rotational KE = Iω
• Rotational KE = (1/2)Iω², analogous to (1/2)mv²
• Rotational KE = Iω²

What is the radius of gyration of a body?

• Half the diameter
• The geometric radius
• The center of mass distance
• The distance from the axis at which the entire mass could be concentrated to give the same moment of inertia