ROTATIONAL MOTION

Why is the centre of mass important in vehicle design?

• To increase speed
• To reduce color intensity
• To ensure stability and proper weight distribution
• To improve radio reception

What is the key insight from Eq. (6.7)?

• It is a random average
• It gives total energy
• The centre of mass is a mass-weighted average of particle positions
• It calculates force

How does the centre of mass behave in a binary star system?

• It orbits one star
• It accelerates
• It remains at rest or moves uniformly if no external force acts
• It disappears

What is the effect of doubling the mass of each particle on the centre of mass position?

• It shifts to the origin
• It doubles
• It remains unchanged
• It becomes zero

What is the condition for the centre of mass to be at rest?

• Only if all particles are at rest
• Only if symmetric
• Zero net external force and zero initial velocity
• Only in space