ROTATIONAL MOTION

What is the angular acceleration if angular speed changes from 40π rad/s to 104π rad/s in 16 s?

• 2π rad/s²
• 3π rad/s²
• 4π rad/s²
• 5π rad/s²

What determines the effectiveness of a force in producing rotation about a fixed axis?

• Magnitude only
• Direction only
• Its component in the plane perpendicular to the axis
• Distance from origin

How is work calculated in rotational motion about a fixed axis?

• By F × r
• By mgh
• By integrating τ dθ
• By P × t

What is the primary simplification in rotational motion about a fixed axis?

• Gravity is ignored
• Only linear motion is analyzed
• Only axial torques are considered
• Mass is constant

Which of the following is NOT a reason to ignore forces parallel to the axis of rotation?

• They produce perpendicular torques
• They are canceled by constraints
• They don't cause rotation
• They contribute to axial torque