Machines

Flagpole

• wedge

• pulley

• incline plane

Lightbulb

• wedge

• screw

• incline plane

Stairs

• wedge

• pulley

• inclined plane

This device

• wedge

• lever

• incline plane

This device

• wedge
• lever
• incline plane
• wheel and axle

What force opposes motion motion and decreases the efficiency of a machine?

• gravity
• friction
• pressure

Consists of two or more simple machines.

• multiple machine
• compound machine
• duplex machine

Which of the following is NOT an example of a compound machine?

• scissors
• fishing pole
• ramp

A _____ is a fixed bar  that us free to move around a fixed point known as a fulcrum.

• pulley
• inclined plane
• lever

A ______ is a grooved wheel with a rope running along the groove.

• lever
• pulley
• screw