Simple and Compound Machines

What is a simple machine?

• A machine that operates automatically without human intervention

• A basic device that changes the direction or magnitude of a force

• A complex machine made up of several moving parts

• A machine that generates electricity

Which of the following is NOT considered a simple machine?

• Lever

• Pulley

• Engine

• Inclined plane

A seesaw on a playground is an example of which type of simple machine?

• Lever

• Pulley

• Inclined plane

• Screw

Which of the following is a common example of a wedge?

• Screw

• Wheelbarrow

• Pulley

• Knife

Which of the following is a compound machine?

• Screw

• Ramp

• Scissors

• Hammer

What is the mechanical advantage of a pulley system that uses 4 ropes to lift an object?

• 4

• 3

• 2

• 1

Which simple machine is used to raise a flag on a flagpole?

• Lever

• Wedge

• Pulley
  

• Inclined plane

A bicycle is an example of a _________________.

• simple machine

• wheel

• pulley

• compound machine

If you wanted to push a heavy box up to a platform, which simple machine would help reduce the effort needed?

• Lever

• Pulley

• Inclined plane

• Wedge

Which of the following statements is true about levers?

• The fulcrum must always be in the middle.

• The load must always be lighter than the effort.

• The effort arm can be longer to increase mechanical advantage.

• Levers do not provide any mechanical advantage.