ROTATIONAL MOTION

What is the direction of the reaction force at the fulcrum of a lever?

• Same as F1
• Same as F2
• Perpendicular to the lever
• Opposite to the applied forces

What is the net force on a body due to a couple?

• Equal to F
• Equal to 2F
• Depends on distance
• Zero

What happens to the moment of a couple if the origin is changed?

• It increases
• It decreases
• It becomes zero
• It remains unchanged

When is the mechanical advantage of a lever greater than one?

• When the load arm is longer
• When forces are equal
• When the fulcrum is at the center
• When the effort arm is larger than the load arm

What is the mechanical advantage of a lever defined as?

• d1/d2
• F2/F1
• R/F1
• F1/F2