Machines Review

What is the main reason people use machines?

• There are many different kinds of machines.

• Machines do the work so people don't have to.

• Machines make work easier and faster.

• Machines can have one part, a few parts, or many parts.

Which two factors determine how much work it takes to do something?

• weight and force

• force and distance

• distance and time

• time and weight

What are simple machines?

• machines that make objects move quickly

• machines that are made up of several other smaller machines

• machines that have few or no moving parts

• machines that are easy to learn how to use

An axe and knife are examples of _____.

• pulleys

• wedges

• levers

• gears

Which kind of simple machine is a wheelchair ramp?

• screw

• wedge

• lever

• inclined plane

Suppose you lean a pole over a rock and use it to lift a heavy object. What kind of simple machine is this?

• a pulley

• a lever

• a wheel and axle

• an inclined plane

Tags

NGSS.MS-PS2-2

Which simple machine would work best to attach a basketball hoop to a wall?

• screw

• lever

• gear

• inclined plane

Flagpole is related to pulleys in the same way that toy car is related to _____.

• wedges

• levers

• wheels and axles

• inclined planes

Tags

NGSS.MS-PS2-2

How do complex machines help people?

• They help us do work that is difficult or complicated.

• They help us do work that is repetitive and boring.

• They help us do dangerous work.

• All of the above

Which kinds of simple machines can be found in this handheld can opener?

• The cutting blade is a wedge. The handles are levers. The part that turns the can is a wheel and axle.

• The cutting blade is a lever. The handles are wedges. The part that turns the can is a gear.

• The cutting blade is an inclined plane. The handles are pulleys. the part that turns the can is a wheel and axle.

• The cutting blade and the handles are levers. The part that turns the can is a screw.