ROTATIONAL MOTION

If two particles are at the same position, where is the centre of mass?

• At origin
• At that same position
• Midway
• Nowhere

What is the effect of doubling all masses on the centre of mass position?

• It doubles
• It halves
• No change in position
• It becomes zero

How does the centre of mass relate to the balance point of a system?

• It is unrelated to balance
• It is the point where the system balances in a uniform gravitational field
• It is the point of maximum weight
• It is always at the bottom

What is the centre of mass of three particles of equal mass at the corners of an equilateral triangle?

• At one vertex
• At the circumcentre
• At the centroid
• Outside the triangle

How is the centre of mass formula adapted for continuous bodies?

• By ignoring mass
• By using only geometry
• By replacing summation with integration
• By assuming point masses