Which of the following BEST tells what a "machine" is?

• anything that has a motor

• a tool that helps us move things

• tools made with wheels and fulcrums

• anything used to lift heavy loads

Which words name two simple machines?

• motor

• lever

• fulcrum

• pulley

• load

Look at the diagram of the seesaw on pg. 304. What does the bar rest on?

• a wheel

• the load

• the fulcrum

• the ground

What do the diagram of a lever and a pulley in the article show?

• how to make objects easier to move

• how to have fun with a simple machine

• how to use a rope to lift something

• how to use a bar to move something

Tags

NGSS.3-5-ETS1-1

Look carefully at the diagram showing a person moving a rock. What does it show about using a lever to lift something?

• the center of the bar should rest on the fulcrum

• the bar should be long and very heavy

• the fulcrum should be closer to the person

• the fulcrum should be closer to the laod

How do the text and the diagrams help you understand the meaning of the word "LOAD?"

Tags

NGSS.MS-PS2-1

How does the diagram of the pulley help you understand how to use a pulley?

• it shows how to attach the object to the rope

• it shows how pulling down on the rope lifts the object

• it shows how fast the wheel has to turn

• it shows how hard a person needs to pull

What are the parts of a pulley? (Look at the diagram.)

What are the parts of a lever? (Look at the diagram.)

Explain how levers and pulleys are used to move things.

Tags

NGSS.MS-PS2-1

NGSS.MS-PS2-2