Simple Machines

It's a double inclined plane.

• Inclined plane

• Wedge

• Pulley

• Bottle opener

It's a wheel rigidly fixed to an axle.

• Pulley

• Tire

• Wedge

• Wheel and axle

It's a rigid bar that is free to rotate about a point called fulcrum.

• Wedge

• Lever

• Pulley

• Screw

It's a wheel that turns readily on an axle.

• Pulley

• Bicycle

• Screw

• Wheel and axle

It's an inclined plane wound around a cylinder.

• Lever

• Screw

• Wedge

• Pulley

Simple machines may be classified into 2 groups: _____ and _____.

• pulleys and wheels and axles

• wedges and levers

• inclined planes and screws

• levers and inclined planes

A _____ is any device that makes doing work easier.

• replica

• prototype

• model

• machine

_____ can do more difficult jobs than simple machines alone.

• Compound machines

• Double machines

• Multiplex machines

• Binary machines

A compound machine or _____ machine has two or more simple machines working together to make work easiwer.

• complementary

• stuffed

• complex

• convoluted

The _____ is a device that allows us to increase the height of an object without lifting it vertically.

• crane

• pulley

• inclined plane

• screw