ROTATIONAL MOTION

What is the moment arm for the weight W about point A?

• Length AB
• Vertical height
• Horizontal distance from A to CG
• Angle θ

What is the moment arm for the force F1 about point A?

• AB
• AC
• BC
• W

What is the main reason for resolving F2 into components?

• To increase force
• To change direction
• To apply equilibrium conditions in perpendicular directions
• To eliminate torque

What is the effect of increasing the mass of the ladder on F1?

• F1 decreases
• F1 unchanged
• F1 increases proportionally
• F1 becomes zero

Why is the kinetic energy expression K = ½ Iω² valid only for fixed-axis rotation?

• Because I changes
• Because v is constant
• Because all particles have the same ω only in such cases
• Because gravity affects it