ROTATIONAL MOTION

What is the role of mass in determining the centre of mass?

• It has no role
• It acts as a weighting factor
• It only affects velocity
• It determines size

How does the centre of mass depend on the choice of coordinate system?

• It changes with coordinate system
• Its position is independent of the coordinate system
• It disappears if origin is changed
• It shifts to origin

What is the total mass M in the centre of mass formula?

• Product of all masses
• Sum of all individual masses
• Difference of masses
• Average of masses

If a system has n particles distributed in space, how many coordinates are needed to define the centre of mass?

• One: X only
• Two: X and Y only
• Three: X, Y, and Z
• Four: including time

How is the position vector of the centre of mass defined in vector form?

• R = ∑mi ri
• R = (∑mi ri)/M
• R = ∑ri/M
• R = M/(∑mi ri)