ROTATIONAL MOTION

Can the centre of mass be outside the material of the body?

• No, never
• Only in liquids
• Yes, in objects like rings or boomerangs
• Only in space

What is the role of gravity in locating the centre of gravity experimentally?

• It pushes the body sideways
• It disappears
• It provides the force that aligns the body to reveal the CG
• It heats the body

What would happen if the knife edges were not at equal distances from the ends?

• The rod would fly
• Nothing would change
• The mass would change
• The symmetry would be broken and reactions would change

How does the uniform cross-section affect the problem in Example 6.8?

• It makes the rod heavier
• It changes the length
• It ensures mass is evenly distributed
• It has no effect

Why is the moment of W₁ positive in the equation of Example 6.8?

• Because it is a weight
• Because it is large
• Because it acts downward
• Because it produces an anticlockwise rotation about G