Simple Machines

Which is not a type of simple machine?

• spring
• screw
• pulley
• wedge

____________ is a force that slows objects down when they rub against each other.

• Plane
• Friction
• A wedge
• A lever

Which of the following is something a roller and a wheel and axle have in common?

• They are both easy to steer.
• They are both cylinders
• They both have to be moved often.
• They both make the ride bumpier.

For a smoother ride, the axle should be placed ____________ of a wheel.

• at the edge
• somewhere near the middle
• at the center

The device used to raise a flag up a flag pole is an example of a 

• wheel and axle 
• lever
• inclined plane 
• pulley 

An axe is an example of a

• pulley
• inclined plane
• screw
• wedge 

A seesaw is an example of a  

• wedge
• lever 
• inclined plane 
• pulley 

The fixed point on the lever is called 

• load
• resistance
• bar
• fulcrum

What is in the middle of a second class level

• Fulcrum
• Effort
• Load

How could I reduce the effort force needed to lift the load?

• move the fulcrum away from the load
• move the fulcrum closer to the load
• place the fulcrum in the middle