ROTATIONAL MOTION

How does the uniform cross-section of the rod affect its centre of gravity?

• It makes the rod longer
• It increases the weight
• It ensures the CG lies at the geometric centre
• It has no effect

What is the significance of marking vertical lines when finding CG experimentally?

• They show wind direction
• They are for decoration
• They indicate magnetic poles
• They represent the line of action of the net gravitational force

In Example 6.8, why is the distance K₁G equal to 25 cm?

• It is measured directly
• By guesswork
• K₁ is at 25 cm mark
• K₁ is 10 cm from end A, G is at 35 cm, so 35 - 10 = 25 cm

Why is the method in Fig. 6.25 not suitable for determining the CG of a liquid?

• Liquids have no mass
• They evaporate
• Gravity doesn't act on them
• Liquids cannot maintain a fixed shape when suspended

What happens if you suspend a body from its centre of gravity?

• It swings violently
• It rotates continuously
• It falls immediately
• It remains in equilibrium in any orientation