ROTATIONAL MOTION

What is the relationship between torque and angular acceleration for constant I?

• Inversely proportional
• Exponential
• No relationship
• Directly proportional

How does symmetry simplify rotational analysis?

• By reducing mass
• By increasing speed
• By aligning angular momentum with the rotation axis
• By decreasing torque

What is the source of the change in rotational kinetic energy during arm movement?

• External torque
• Gravitational pull
• Frictional force
• Internal work done by muscles

What is the condition under which τ = Iα is not valid?

• When ω is high
• When α is small
• When torque is constant
• When moment of inertia changes with time

Why can't perpendicular torque change the rotational motion in fixed-axis systems?

• Because torque is too small
• Because friction absorbs it
• Because the axis constrains rotational degrees of freedom
• Because gravity cancels it