ROTATIONAL MOTION

Where should a force be applied on a door to produce maximum rotational effect?

• Near the hinge
• At the center, parallel to door
• At the outer edge, perpendicular to the door
• Anywhere along the vertical axis

Why is a force applied at the hinges of a door ineffective in producing rotation?

• Because friction cancels it
• Because the door is fixed
• Because the perpendicular distance from axis is zero
• Because force is too small

What physical quantity is analogous to force in rotational motion?

• Linear momentum
• Impulse
• Torque
• Kinetic energy

How is angular acceleration represented mathematically for fixed-axis rotation?

• α = dθ/dt
• α = dv/dt
• α = d²θ/dt²
• α = dω/dt

What is the definition of angular acceleration?

• Rate of change of angular displacement
• Rate of change of linear velocity
• Change in radius per unit time
• Rate of change of angular velocity with time