ROTATIONAL MOTION

What is the main outcome of Eq. (6.10)?

• Only external forces matter
• The system is at rest
• The total force equals the sum of all individual forces on particles
• Kinetic energy is conserved

What happens to the centre of mass when a person walks inside a boat on still water?

• It moves forward
• It moves backward
• It does not move horizontally
• It moves up and down

How is the centre of mass useful in collision analysis?

• It stops during collision
• It changes direction
• It moves uniformly if no external force acts
• It explodes

What is the key assumption in deriving Eq. (6.9)?

• Velocities are zero
• Forces are balanced
• Masses of particles are constant
• Acceleration is zero

How does the centre of mass help in space missions?

• It reduces fuel consumption
• It increases speed
• It ensures proper orientation and trajectory control
• It prevents collisions