ROTATIONAL MOTION

What is the physical significance of Eq. (6.11)?

• It describes rotational motion
• It gives kinetic energy
• The centre of mass moves under external forces as if it were a point mass
• It calculates torque

How is the centre of mass acceleration affected by symmetric internal forces?

• It increases acceleration
• It decreases acceleration
• It changes direction
• Not affected at all

What is the condition for the centre of mass to remain at rest?

• Only if all particles are at rest
• Only if symmetric
• Initial velocity zero and no external force
• Only in vacuum

In which type of motion is the centre of mass concept most useful?

• Vibrational motion
• Oscillatory motion
• Rotational motion
• Translational motion

What is the dimensional formula of the centre of mass position?

• [M¹L¹T⁻²]
• [M⁰L¹T⁻¹]
• [M⁰L¹T⁰]
• [M¹L²T⁻²]