3rd Electric and Magnetic Forces

Sheila has a toy train like the one shown above. Why do the cars in her train stay together?

• They are held together by a person.

• They are held together by tape.

• They are held together by train tracks.

• They are held together by magnets.

A balloon that has been rubbed on wool has a negative charge. When the balloon is held over—but not touching—some bits of paper, some of the bits jump up to the balloon. Why does the paper move?

• Some wind must have blown the paper.

• A charged object can make other objects move without touching them.

• A charged object can only push against other objects.

• All balloons are magnets that can pull on plastic or paper without touching it.

Tags

NGSS.MS-PS2-5

Two magnets are shown above. What will happen if the magnets are slowly moved toward each other?

• The magnets will push against each other with a stronger force.

• The magnets will attract each other with a stronger force.

• The magnets will attract each other with a weaker force.

• The magnets will push against each other with a weaker force

Tags

NGSS.MS-PS2-5

NGSS.MS-PS2-3

Alan dropped a nail in a pile of leaves. He needs to find it. Which of these things can help him the most?

• a chair

• a hammer

• a magnet

• a drill

Gayle's teacher gave her a mixture of sand and iron filings. Gayle decided to use an electromagnet to separate the mixture. She turned on the magnet and ran it through the sand. Then she pulled it out, held it over a container, and turned it off.What happened when Gayle turned off the electromagnet?

• Iron filings fell from the electromagnet into the container.

• Sand fell from the electromagnet into the container.

• Sand from the container stuck to the magnet.

• Iron filings from the container stuck to the magnet.

Tags

NGSS.MS-PS2-5

NGSS.MS-PS1-2

Haley rubs a balloon against her head. Her hair becomes positively charged. The balloon becomes negatively charged. If Haley moves the balloon away from her head, her hair will

• not be affected by the balloon in any way.

• be pushed away by the balloon and move away from it.

• be damaged by the balloon and fall out.

• be pulled toward the balloon and follow it.

Tags

NGSS.MS-PS2-5

NGSS.MS-PS2-3

In the picture above, what will most likely happen?

• Nothing will happen.

• The magnets will repel each other.

• The magnets will break.

• The magnets will attract each other.

Tags

NGSS.MS-PS2-5

NGSS.MS-PS2-3

Which picture shows an example of objects being held together by magnets?

• 
• 
• 
• 

Tags

NGSS.MS-PS2-5

NGSS.MS-PS2-3

Jeanna went to a store that sold little glass animals. Near the cash register was a floating glass swan. There was a small black disc attached to the bottom of the swan. The box it floated over was plugged in. Jeanna carefully studied the box and swan. Which of the following conclusions she made was incorrect?

• The force of magnetism was making the swan float.

• A magnet was attached to the bottom of the swan.

• The box under the swam was made of metal.

• The box under the swan used electromagnets.

Tags

NGSS.MS-PS2-5

NGSS.MS-PS2-3

Fred rubs a glass rod against a piece of silk, which causes the glass rod to become positively charged. Fred moves the charged rod close to a group of small, uncharged pieces of paper. The paper pieces move toward the rod. Based on this information, Fred can determine that charged objects can

• push uncharged objects away.

• destroy uncharged objects.

• pull uncharged objects.

• only pull other charged objects

Tags

NGSS.MS-PS2-5

NGSS.MS-PS2-3