Page 33 - Science Course 3 (Book 2)

7. Whether an object becomes positively or negatively charged depends on the material it (repels/contacts).

8. Electrons transfer from a material that holds electrons (more/less) tightly to a material that holds electrons
(more/less) tightly.

9. Wool does not hold electrons as tightly as rubber, so when a wool sweater and a rubber balloon are rubbed
together, electrons transfer from the (sweater/balloon) to the (sweater/balloon).

Mo9-L1: Key Concept Check

Direction: Answer each question in the space provided.

Question Answer
1. What is an electric force?

2. What is an electric f eld?

3. How will two positively charged
objects interact?

4. How will two negatively charged
objects interact?

5. How will a negatively charged
object and a positively charged
object interact?

6. What can you infer about the
electric charges of two objects
that attract each other?

7. What can you infer about the
electric charges of two objects
that repel each other?

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