ROTATIONAL MOTION

How is the acceleration of the centre of mass obtained from velocity?

• By integrating velocity
• By multiplying velocity with mass
• By taking the time derivative of the centre of mass velocity
• By squaring the velocity

What does M represent in the equation M = + + + V v v v 1 1 2 2 ... n n m m m?

• Mass of the first particle
• Reduced mass of the system
• Total mass of the system
• Average mass of particles

Why can we ignore internal forces when studying the motion of the centre of mass?

• Because they are negligible
• Because they act perpendicular to motion
• Because they cancel in pairs
• Because they are variable

What is the significance of Eq. (6.7) in the context of centre of mass?

• It gives the total kinetic energy
• It gives the angular momentum
• It gives the position vector of the centre of mass
• It gives the torque on the system

How is the velocity of the centre of mass defined?

• d/dt = A V
• d/dt = F p
• d/dt = V r
• d/dt = V R