ROTATIONAL MOTION

What condition leads to conservation of angular momentum?

• Net external force is zero
• Only gravity acts
• All particles are at rest
• Net external torque is zero

How do external forces influence the motion of the center of mass?

• They have no effect
• They act only on edges
• They cancel out
• The center of mass moves as if all external forces act on it

If a system is isolated from external forces, how does its center of mass move?

• It accelerates randomly
• It comes to rest
• It moves in a circle
• With constant velocity

What effect do internal forces have on the total linear momentum of a system?

• They increase it
• They decrease it
• They reverse it
• They do not change it

In general rotation with one point fixed, what is the origin for r in v = ω × r?

• The Earth's center
• The highest point
• The edge point
• The fixed point