Compound Machines

What do machines help us do?

• Make work harder

• Make work easier

• Make work slower

• Make work boring

Which simple machine is like a ramp that helps move heavy things up or down?

• Lever

• Pulley

• Inclined plane

• Wheel and axle

What is a lever used for?

• To cut things

• To spin things

• To lift things

• To hold things together

What simple machine helps make moving or turning things easier, like a rolling cart?

• Wedge

• Pulley

• Screw

• Wheel and axle

What does a pulley use to lift loads?

• Gears and levers

• A wheel and ropes or chains

• A twisted inclined plane

• A long bar and a fulcrum

What simple machine helps to cut or split things, like the blade of an axe?

• Screw

• Wedge

• Lever

• Pulley

What are gears?

• Tools for lifting

• Special wheels with teeth

• Ropes for pulling

• Flat surfaces for sliding

What is a screw?

• A straight bar

• A twisted inclined plane

• A type of pulley

• A flat ramp

What do we call a machine that combines two or more simple machines?

• A complex tool

• A super machine

• A compound machine

• A simple machine

Which of these is an example of a compound machine?

• An axe

• A ramp

• A can opener

• A see-saw