Energy/Motion/ Simple Machines Chapter 8 review

Motion is

• a change in position

• a push or a pull

• doing work

Work is measured by how much force it takes to move an object and how far the object was moved

• True

• False

A student carrying a heavy box is doing __________ work than a student carrying a lighter box

• less

• more

• the same amount of

Friction is beneficial because it

• helps you float through the air like an astronaut

• pulls your car wheels toward the Earth's center

• keeps a basketball player from slipping and sliding on the court

• drives a tractor

A bar that turns on a point is a

• wedge

• lever

• inclined plane

• wheel and axle

Work is done when something is moved over a distance

• True

• False

The axle in a wheel and axle turns with greater force than the wheel does. The axle also moves ________

• a greater distance

• the same distance

• less distance

When the wheel of a wheel and axle turns one time, the wheel

• travels a shorter distance

• travels a greater distance than the axle does

• does not move

A simple machine used to move a school's flag up the flagpole is an example of a _________

• pulley

• inclined plane

• screw

A simple machine made of a wheel with a groove that holds a rope is __________

• an inclined plane

• a wedge

• a pulley