ROTATIONAL MOTION

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

• It has no effect
• It shifts the CG upward
• It places the CG at the geometric centre for uniform objects
• It makes the CG unpredictable

What is the main assumption that allows using centre of mass as centre of gravity?

• The object is spherical
• The object is flat
• Mass is concentrated at a point
• Gravitational field is uniform

Why is the centre of gravity important in balancing objects?

• It is always at the centre
• It is the lightest point
• It determines the point where weight can be considered to act
• It has no mass

Which principle allows us to find the centre of gravity by suspension?

• Newton's third law
• Conservation of energy
• Rotational equilibrium under gravity
• Linear momentum conservation

What is the distance between the two knife edges in Example 6.8?

• 40 cm
• 50 cm
• 60 cm
• 70 cm