ROTATIONAL MOTION

What is the effect on mechanical advantage if both arms are equal?

• It is zero
• It is infinite
• It is less than one
• It is equal to one

Why is the reaction force not included in moment calculations about the fulcrum?

• Because it is too small
• Because it is horizontal
• Because it is negligible
• Because its distance from fulcrum is zero

What is the main difference between a couple and a single force?

• Magnitude
• Direction
• Point of application
• A couple has zero net force but produces torque

If d1F1 = d2F2, what can be said about the lever?

• It is accelerating
• It is in translational motion
• It is weightless
• It is in rotational equilibrium

What happens to the load if the effort is removed from a balanced lever?

• It stays in place
• It moves upward
• It disappears
• It moves downward