SCIENCE 9
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CHAPTER 7 REVIEW
1. What are the 3 laws of static charges?
2. According to the laws of static charge, explain how neutral objects react to positively charged
objects?
3. According to the laws of static charge, explain how neutral objects react to negatively charged
objects?
4. How is electrical force related to the distance between 2 objects and the charge on objects( refer to
workbook page 104)
5. A charge is transferred from one conductor to another conductor by touching. Is this an example of
charging by conduction or induction?
6. A charge is relocated within a conductor because there is a charged object nearby. Is this an
example of charging by conduction or induction?
Circle the letter of correct answer
7. Static electricity refers to charges that
A. travel through a conductor
B. exist on a neutral object
C. can be collected and held in one place
D. power your computer
8. Which of the following correctly identifies the charges on the particles of an atom?
Proton
Electron
Neutron
A.
positive
neutral
negative
B.
negative
positive
neutral
C.
neutral
negative
positive
D.
positive
negative
neutral
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9. Which of the following statements describes a solid neutral object becoming positively charged?
A. Protons have been removed from this object.
B. Electrons have been removed from this object.
C. Protons have been added to this object.
D. Electrons have been added to this object.
10. An object that contains 5 million electrons can still be neutral because
A. electrons have no charge
B. the electrons are spread out evenly in the object
C. it also contains 5 million protons
D. the object is an insulator
11. Static charge can apply a force without touching the other object. This type of force is called
A. action-at-a-distance force
C. contact force
B. long distance force
D. imaginary force
12. Which of the following is true of charged objects?
A. Like charges attract and opposite charges repel.
B. Like charges repel and neutral objects are repelled by charged objects.
C. Like charges repel and neutral objects are attracted to charged objects
D. Like charges attract and neutral objects are attracted to charged objects.
13. Which of the following would increase the force between two charged objects?
A. increasing the distance between the objects
B. increasing the charge on the objects
C. decreasing the charge on the objects
D. none of the above
14. Which of the following best describes a neutral solid object that is charged by conduction?
A. The electrons in the neutral solid object relocate when a charged object comes
into contact with the neutral object.
B. The protons in the neutral solid object relocate when a charged object comes
into contact with the neutral object.
C. The electrons in the neutral object transfer onto a positively charged object.
D. The protons in the neutral object transfer onto a negatively charged object.
15. Which of the following best describes a neutral solid object that is charged by induction?
A. The electrons in the neutral solid object relocate when a charged object is
brought near.
B. The protons in the neutral solid object relocate when a charged object is
brought near.
C. The electrons in the neutral object transfer onto a positively charged object.
D. The protons in the neutral object transfer onto a negatively charged object.
16. An electroscope that is charged positive would have its metal leaves separated. A negatively charged
rod is brought close to, but not touching the knob of the positive electroscope.
The metal leaves would
A. move farther apart
B. move closer together
C. not move
D. become negatively charged
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Match the Term on the left with the best Descriptor on the right.
Each Descriptor may be used only once.
Term
_____ 17. electroscope
_____ 18. Van de Graaff generator
_____ 19. acetate
_____ 20. conductor
_____ 21. grounding
_____ 22. coulomb
Descriptor
A. materials that allow electrons to
travel freely
B. the unit of electric charge
C. device used to produce large amounts of
static charge
D. allowing charge to flow into Earth’s
surface
E. materials that do not allow electrons
to travel freely
F. device used to detect static charge
G. acquires a negative charge by friction
23. Two charged objects are positioned 5 cm away from each other. Describe the change in the force
between these two objects when
(a) the charge on one of the objects is increased
(b) the distance between the objects is increased to 10 cm
(c) the charge on both of the objects is decreased
Use the following diagram of a neutral solid
object to answer question 24.
24. Use () to represent electrons and (+) to represent protons to complete the diagrams.
(a) A positive rod is positioned near the original object.
(b) A positive rod is touched to the original object.
25. The Styrofoam™ chips used for packing often have a static charge and “cling” to you. Describe how you
could use an acetate strip to determine whether the Styrofoam™ chips are positively or negatively
charged.
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