ROTATIONAL MOTION

What is the work done by a torque τ causing an angular displacement dθ?

• τ θ
• F r dθ
• τ dθ
• I ω²

Why is the position vector component along the axis ignored in torque calculation?

• It is too small
• It causes heating
• It produces torque perpendicular to the axis
• It increases inertia

What is the significance of the fixed axis assumption in rotational dynamics?

• It eliminates gravity
• It makes mass irrelevant
• It allows ignoring perpendicular torque components
• It stops all motion

In the equation θ = ω₀t + ½αt², what does ω₀ represent?

• Final angular speed
• Average angular speed
• Angular acceleration
• Initial angular speed

What is the formula for angular acceleration?

• α = ω/t
• α = (ω + ω₀)/t
• α = (ω - ω₀)/t
• α = ω₀²/(2θ)