ROTATIONAL MOTION

How does the torque due to a force depend on the point of reference?

• It is always the same
• It depends on mass
• It changes with the choice of origin
• It is independent of direction

Why is the total angular momentum conserved in an isolated system?

• It has no internal energy
• It moves in a straight line
• No external torque acts on it
• It is symmetric

What is the main assumption that allows τ_int = 0?

• Particles are point-like
• Velocities are constant
• Internal forces are central
• External fields are absent

How does a planet maintain constant angular momentum in orbit?

• It uses internal fuel
• It experiences no forces
• Gravitational force is central and produces no torque about the sun
• It rotates on its axis

What happens to angular momentum during an internal explosion in space?

• L is destroyed
• L increases suddenly
• Total L remains unchanged
• L becomes random