Simple Machines

Flagpole

• wedge
• pulley
• incline plane
• wheel and axle

Lightbulb

• wedge
• pulley
• incline plane
• screw

Stairs

• wedge
• pulley
• inclined plane
• wheel and axle

A _______ pulley is used to reduce the amount of effort force.

• movable
• fixed
• single

A _____ pulley only changes the direction of the force.

• movable
• fixed
• alternate

A sloping force, like a ramp, that reduces the mount of force required to lift an object.

• screw
• wheel and axle
• inclined plane

How can an incline plane reduce the amount of force required to lift an object?

• increase the length of the ramp
• increase the height of the ramp
• decrease the length of the ramp

Why is no machine 100% efficient?

• some of the input energy is converted to mechanical energy in the environment
• some of the input energy is converted to chemical energy in the environment
• some of the input energy is converted to heat energy in the environment
• All machines can be 100% efficient

Pedals, handle bars and handbrakes on a bicycle

• wedges
• pulleys
• incline planes
• levers

This device

• wedge
• lever
• incline plane
• wheel and axle