Chapter 2 Lesson 4 Assessment: What can Electrical Forces Do?

What is an electric force?

• a buildup of electric charges in an object

• an imbalance of negative and positive charges

• A push or pull between objects that have an electric charge

Which of the following would have the strongest pull toward each other?

• A. like charges that are far apart

• B. unlike charges that are far apart

• C. unlike charges that are close together

Static electricity is created when

• there is an imbalance of positive and negative charges

• like electric charges pull towards each other

• unlike electric charges repel each other

Which of the following is an example of like electric charges repelling?

• clothes rubbing together in the dryer

• two balloons pushing each other apart

• a balloon with a charge lifting your hair

How is lightning created?

• like charges in a cloud attract

• like charges in a cloud repel

• unlike charges in a cloud attract

Paul has 3 balloons and 3 piles of shredded paper. He wants to see which balloon will attract more pieces of paper. Based on what Paul knows about electric force, which prediction would he MOST LIKELY make about the balloons?

• balloon A

• balloon B

• balloon C

Which combination of charges will attract each other?

• a positive charge and a positive charge

• a negative charge and a negative charge

• a positive charge and a negative charge

How can you decrease the electric force between two charged objects?

• Rub them together

• Bring them closer together

• Move them far apart

Which of these events is caused by electric charges?

• A. A lightning strike

• B. An earthquake

• C. A snowstorm

Why do some of the clothes stick together?

• They only have positive charges

• They only have negative charges

• They have imbalanced positive and negative charges