ROTATIONAL MOTION

Why is the expression dW = τdθ analogous to dW = Fds?

• Because both involve time
• Because τ = F and dθ = ds
• Because torque τ corresponds to force F and dθ corresponds to ds
• Because they have same units

What is the role of the moment of inertia in rotational motion?

• It measures linear speed
• It determines gravitational force
• It measures the body's resistance to angular acceleration
• It gives torque direction

What is the condition for zero work in rotational motion?

• When mass is zero
• When time is infinite
• When torque is zero or angular displacement is zero
• When force is constant

What is the rotational analog of displacement in linear motion?

• Angular velocity
• Torque
• Angular displacement
• Moment of inertia

What is the work done when a force is applied parallel to the axis of rotation?

• Maximum
• Negative
• Zero
• Depends on time