ROTATIONAL MOTION

What is the significance of Eq. (6.28b) in mechanics?

• It defines kinetic energy
• It calculates center of mass
• It relates force to acceleration
• It relates torque to rate of change of angular momentum

Why is the assumption of central internal forces important?

• It increases internal energy
• It causes deformation
• It ensures τ_int = 0
• It changes mass distribution

What is the role of internal forces in angular momentum change?

• They increase angular momentum
• They decrease angular momentum
• They do not change the total angular momentum
• They reverse the direction of rotation

What does Lx = K1 signify in angular momentum conservation?

• The system rotates about x-axis
• The net torque along x is zero
• The x-component of L is constant
• The angular speed is constant

Which of the following is true about angular momentum conservation?

• It requires zero external force
• It only applies to rigid bodies
• It applies when net external torque is zero
• It depends on linear velocity