LEVERS

if a load of a lever is 100 newtons and the force you apply is 20 newtons, what is your mechanical advantage?

• 120 N

• 5 N

• 2000 N

The amount by which a machine multiplies input force is known as the 

• work.

• output force.

• mechanical advantage.

How much work is done in holding a 15 N sack of potatoes while waiting in line at the grocery store for 3 minutes?

• 45 J

• 0 J

• 5 J

A rigid bar that is free to pivot, or rotate, on a fixed point is a :

• wedge

• lever

• fulcrum

3. Which type of lever is this?

• First Class Lever
• Second Class Lever
• Third Class Lever

A see saw is an example of a:

• 1st class lever
• 2nd class lever
• 3rd class lever

A wheelbarrow is an example of a:

• 1st class lever
• 2nd class lever
• 3rd class lever

• 1st Class

• 2nd Class

• 3rd Class

Jeff is a landscaping contractor and lifts a rock weighing 600 pounds by wedging a board under the rock. Jeff weighs 150 pounds and puts all of his weight on the lever. What was his MA?

• 0

• 2

• 4

To increase the mechanical advantage of a lever

• make sure the fulcrum is in the middle of the lever
• move the fulcrum closer to the load
• move the fulcrum closer to the effort
• use a bigger fulcrum