ROTATIONAL MOTION

Can a body have more than one centre of gravity?

• Yes, depending on color
• Yes, for liquids
• No, a rigid body has only one centre of gravity
• Yes, always two

Which physical law explains why the reaction force equals the weight in equilibrium?

• Newton's first law
• Law of gravitation
• Conservation of momentum
• Newton's third law of motion

What is the unit of gravitational torque?

• Kilogram-meter
• Meter per second squared
• Watt
• Newton-meter (N·m)

How does symmetry influence the location of the centre of gravity?

• It has no influence
• It shifts the CG randomly
• It places the CG at the geometric centre for uniform objects
• It hides the CG

Why is the pencil tip narrow in the balancing experiment?

• To increase friction
• To reduce weight
• To conduct electricity
• To minimize the contact area and precisely locate the balance point