ROTATIONAL MOTION

How does the centre of mass behave when a system explodes into fragments?

• It stops suddenly
• It accelerates randomly
• It continues along the original trajectory
• It moves with fragments

If two particles of different masses are on the x-axis, how does the centre of mass compare to the midpoint?

• It coincides with midpoint
• It is closer to the lighter particle
• It is closer to the heavier particle
• It is at the origin

What is the effect on the centre of mass if a particle is moved perpendicularly away from the current centre of mass?

• It remains unchanged
• It shifts in the direction of the movement
• It moves in the opposite direction
• It becomes zero

How is the centre of mass formula adapted when particles are distributed in 3D space?

• By ignoring the z-axis
• By using only x and y
• By including z-coordinates in the calculation
• By assuming z=0 for all

For a system with symmetric mass distribution about the y-axis, what is the X-coordinate of the centre of mass?

• Equal to Y
• Maximum value
• Zero
• Depends on mass