ROTATIONAL MOTION

What determines the rotational effect of a force in a lever?

• Color of the lever
• Temperature
• Material density
• Perpendicular distance from fulcrum

If a force is applied at the fulcrum, what is its moment?

• F
• F × d
• Infinite
• Zero

What is the mechanical advantage if effort is 20 N and load is 80 N?

• 0.25
• 1
• 2
• 4

How is the principle of moments expressed mathematically?

• F₁ + F₂ = R
• d₁ + d₂ = L
• F₁/F₂ = d₁/d₂
• d₁F₁ = d₂F₂

What is the effect of a couple on a body fixed at its center?

• It moves linearly
• It breaks
• It remains stationary
• It causes rotation about the center