Mechanical Advantage and Ideal Mechanical Advantage Assessment

Which of the following defines mechanical advantage?

• How much the simple machine will decrease the amount of effort needed.

• How pretty the machine is.

• The difference between input and output force.

• The speed at which the load moves.

In a first-class lever, where is the fulcrum located?

• At the effort force.

• At the resistance force.

• Between the effoort and resistance forces.

• Anywhere you want.

A second-class lever always provides:

• A mechanical advantage greater than 1.

• A mechanical advantage less than 1.

• No mechanical advantage.

• A mechanical advantage of exactly 1.

Which of the following is an example of a first-class lever?

• Wheelbarrow

• Nutcracker

• Seesaw

• Tweezers

Which of the following is an example of a second-class lever?

• Crowbar

• Scissors

• Nutcracker

• Fishing rod

If the input force is 50 N and the output force is 200 N, what is the mechanical advantage?

• MA - resistance force/effort force

• IMA - effort distance/resistance distance

• MA - resistance force/effort force

• IMA - effort distance/resistance distance

A lever with an effort arm of 1.5 m and a resistance arm of 0.5 m has a mechanical advantage of:

MA - resistance force/effort force

IMA - effort distance/resistance distance

• 0.33

• 1.0

• 2.0

• 3.0

What happens to the mechanical advantage when the effort arm increases relative to the resistance arm?

• It increases.

• It decreases.

• It stays the same.

• It becomes 1.

In a second-class lever, the:

• Fulcrum is between the effort and load.

• Load is between the fulcrum and the effort.

• Effort is between the load and fulcrum.

• Load is closest to the fulcrum.

If a lever has a mechanical advantage of 5, how much force is needed to lift a 100 N load? MA - resistance force/effort force IMA - effort distance/resistance distance

• 5 N

• 10 N

• 20 N

• 35 N