ROTATIONAL MOTION

What is the nature of the centre of mass in a symmetric body?

• It lies outside
• It is shifted to one side
• It lies at the geometric centre
• It is undefined

What is the foundation of Eq. (6.8)?

• Integration of force
• Differentiation of momentum
• Differentiation of the centre of mass position with respect to time
• Summation of energies

How does the centre of mass move when external force is constant?

• With variable acceleration
• With decreasing speed
• With constant acceleration
• In oscillation

What is the implication of constant centre of mass velocity?

• All forces are zero
• Internal forces are zero
• Net external force is zero
• The system is at rest

If a body is pivoted at its centre of mass, what is its rotational equilibrium?

• Always unstable
• Never in equilibrium
• It is in rotational equilibrium if no net torque
• It rotates automatically