ROTATIONAL MOTION

Why does a radial force do no work on a rotating particle?

• Because it is too small
• Because displacement is zero
• Because it is perpendicular to the tangential displacement
• Because mass is constant

What determines the magnitude of torque about an axis?

• Only force magnitude
• Only distance
• Product of force and perpendicular distance from the axis
• Angle θ only

How is angular velocity ω defined in terms of angular displacement?

• ω = θ/t
• ω = d²θ/dt²
• ω = rθ
• ω = dθ/dt

What is the rotational analog of Newton's second law?

• F = Ma
• τ = Iω
• τ = Iα
• L = Iω

Why are torques added algebraically when acting on a rigid body about a fixed axis?

• Because they are perpendicular
• Because they cancel out
• Because all torques are parallel to the axis and can be treated as scalars
• Because only one torque acts