Simple Machines

1. What is true about all simple machines?

• They all lift things.b. They all have moving parts.c.  They all make work easier.d.  They all have just one part.
  
• b. They all have moving parts.c.  They all make work easier.d.
• They all make work easier.
• They all have just one part.

A worker needs to lift a heavy concrete block from the ground to the second floor of a building.  What would be the BEST simple machine for the worker to use?

• wheel and axle
  
• lever
• pulley
• screw

Which is NOT an example of a simple machine?

• bottle opener
• wheel chair ramp
• steering wheel
• wedge

Which simple machine is used to help turn something?

• inclined plane
• pulley
• wheel and axle
• wedge

Kevin wants to split a piece of wood.  Which simple machine should he use to make the job easier?

• inclined plane
• pulley
• wheel and axle
• wedge

For which job is a lever the BEST tool?

• holding things together
• lowering a heavy object
  
• lifting a heavy object
  
• cutting something