Week 7 - Science - Topic 2, Lesson 1 - Electric Forces

Kim rubs a glass rod with a silk cloth. She moves the glass rod close to some foam. Look at the picture of the rod and foam.

The glass rod has a _________ electric charge.

• positive

• neutral

• negative

Tags

NGSS.MS-PS2-3

Kim rubs a glass rod with a silk cloth. She moves the glass rod close to some foam. Look at the picture of the rod and foam.

The foam pieces have a _________ charge.

• positive

• neutral

• negative

Tags

NGSS.MS-PS2-3

The glass rod and the foam have an ______________ between them.

• insulator

• electric force

Tags

NGSS.MS-PS2-3

The charges of the two objects are _________.

• the same

• different

It cause the glass rod and the foam to __________.

• repel

• attract

Tags

NGSS.MS-PS2-3

NGSS.MS-PS2-5

Kim slowly moves the glass rod farther away from the foam and observes what happens to the foam. What question is Kim most likely trying to answer?

• A. How does electric force change when the charge on one material changes?

• B. How does the length of the glass rod affect electric force?

• C. How does distance affect the strength of electric force?

• D. How can electric force between two objects be observed?

Tags

NGSS.MS-PS2-3

Pedro has two inflated balloons. He knows that one balloon has an overall negative electric charge. He predicts that when he places the balloons next to each other, the two balloons will repel. What must be true for the two balloons to repel?

• The overall charge of each balloon must be negative.

• The balloons must touch each other.

• One balloon must be larger than the other.

• The overall charge of one balloon must be positive.

Tags

NGSS.MS-PS2-3

NGSS.MS-PS2-5

Xavier experiences static discharge between his hand and a metal chair.

Which step happens first (1st)?

• Xavier´s skin gets electrically charged.

• There is static discharge between Xavier´s hand and the chair.

• Xavier walks across a wool carpet.

• Xavier moves his hand close to the chair.

Xavier experiences static discharge between his hand and a metal chair.

Which step happens second (2nd)?

• Xavier´s skin gets electrically charged.

• There is static discharge between Xavier´s hand and the chair.

• Xavier walks across a wool carpet.

• Xavier moves his hand close to the chair.

Xavier experiences static discharge between his hand and a metal chair.

Which step happens third (3rd)?

• Xavier´s skin gets electrically charged.

• There is static discharge between Xavier´s hand and the chair.

• Xavier walks across a wool carpet.

• Xavier moves his hand close to the chair.

Tags

NGSS.MS-PS2-5