ROTATIONAL MOTION

What is the effect of internal forces on the total angular momentum of a system?

• They increase it
• They decrease it
• They do not change the total angular momentum
• They reverse its direction

Where is the center of gravity located in a body?

• At the geometric center
• At the point where total gravitational torque is zero
• At the heaviest point
• At the topmost point

How does the center of gravity differ from the center of mass?

• They are always the same
• They differ by 1 meter
• They coincide only if the gravitational field is uniform
• The center of gravity is always higher

When is the total torque on a system independent of the origin?

• When the system is at rest
• When the total external force is zero
• When the body is spherical
• When angular momentum is zero

Is the total external torque always zero when the total external force is zero?

• Yes
• No
• Only in fluids
• Only in solids