Brain Pop Simple Machines

What is a lever?

• any piece of metal that bends

• any bar or a rod that's set up to tilt on a fulcrum

• any bar that's used to lift a load

• any bar that's attached to a pulley

Which device uses a lever?

• A seesaw

• A pair of tweezers

• A wheelbarrow

• All of the above

What happens if you decrease the distance between the fulcrum and the load?

• You have to use more force to move the load

• You can use less force to move the load

• You have to decrease the length of the lever

• You have to increase the height of the fulcrum

What defines a first-class lever (the man and the pig from yesterday)?

• The fulcrum is between the effort and the load

• The load is exactly centered between the fulcrum and the lever

• The effort is between the fulcrum and the load

• The effort is between the fulcrum and the lever

Which of the following is a true statement?

• It's easier to lift a heavy weight straight up than it is to slide it up a ramp

• When you use a lot of effort, a load becomes lighter

• When you use a minimum amount of effort, a load becomes heavier

• When you increase the distance over which effort is expended, you don't have to work as hard

What defines a third-class lever?

• the fulcrum is between the effort and the load

• the fulcrum is in the exact center

• the fulcrum and lever are equidistant from the load

• the effort is between the fulcrum and the load

How is a class 3 lever different from class 1 and class 2 levers?

• a class 3 lever makes the job easier, but decreases the amount of the load

• a class 3 lever makes the job easier, but increases the movement of the load

• a class 3 lever makes the job harder (for everyone but Asher), but increases the movement of the load

• a class 3 lever makes the job harder, but decreases the movement of the load

Which of the following is a second-class lever?

• 
• 
• 
• 

A wheelbarrow is an example of a:

• 1st class lever

• 2nd class lever

• 3rd class lever

A see saw is an example of a:

• 1st class lever

• 2nd class lever

• 3rd class lever