ROTATIONAL MOTION

How is the kinetic energy of a rotating body expressed in terms of moment of inertia?

• K = Iω
• K = ½ Iω
• K = ½ Iω²
• K = Iω²

What is the centre of gravity of the ladder assumed to be?

• At point A
• At point B
• At its midpoint
• At point C

Why is F1 perpendicular to the wall?

• The ladder is smooth
• Gravity acts downward
• The wall is frictionless
• F2 is large

What is the role of friction in the ladder problem?

• Supports the weight
• Reduces normal force
• Prevents sliding away from the wall
• Increases torque

Which equation represents rotational equilibrium about point A?

• F1 = F
• N = W
• Moment of W + Moment of F1 = 0
• F2 = N + F