ROTATIONAL MOTION

What is the significance of the intersection point of verticals in Fig. 6.25?

• It shows the heaviest part
• It marks the geometric centre
• It balances the object
• It indicates the centre of gravity

Why is G chosen as the point for taking moments in Example 6.8?

• Because it is the midpoint
• To include all forces
• Because it is easy to mark
• To eliminate the moment of the rod's weight

What is the primary factor determining the centre of mass?

• Gravitational field
• External forces
• Distribution of mass
• Shape only

What happens to the centre of gravity and centre of mass if g varies across a body?

• They coincide
• They both shift
• They cancel each other
• They do not coincide

When is the centre of mass the same as the centre of gravity?

• Always
• Never
• When the body is large
• When the body is small enough that g is constant