ROTATIONAL MOTION

What happens to the component of a position vector that lies along the axis of rotation when computing torque?

• It increases the moment of inertia
• It contributes directly to angular acceleration
• It produces torque along the axis
• It produces torque perpendicular to the axis and is ignored

Which forces should be considered when calculating torque about a fixed axis?

• All gravitational forces
• Forces parallel to the axis
• Forces lying in planes perpendicular to the axis
• Internal forces only

Why are perpendicular components of external torques ignored in fixed-axis rotation?

• They are too small to matter
• They do not exist in real systems
• Friction absorbs them
• Constraint forces cancel their effect

In rotational motion about a fixed axis, which components of torque are effective in producing rotation?

• All components equally
• Components perpendicular to the axis
• Components along the fixed axis
• Radial components only

Which physical quantity in rotational motion is analogous to force in linear motion?

• Moment of inertia
• Angular momentum
• Torque
• Kinetic energy