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Types of Interactions Study Guide Name_____________________________ 8th Grade PSI Multiple Choice- Choose the best answer. Justify each answer in the space provided below. 1. Which of the following is NOT an example of a force being exerted through a field? a. b. c. d. Gravity pulling on a falling apple A man pushing a car A magnet attracting a steel ball An electrically charged balloon pushing on another balloon from across the room 2. Unbalanced forces acting on an object will cause it to accelerate (change velocity). True False 3. The force of gravity _________ as the object's mass decreases. a. increases b. remains constant c. decreases 4. The force of gravity _________ as the distance between two objects decreases. a. increases b. remains Constant c. decreases 5. The force of gravity decreases at a constant rate as we move away from a planet like Jupiter. True False 6. As we move away from the Sun, the force of gravity gets weaker by an inverse of: a. distance cubed b. distance c. distance squared www.njctl.org 8th Grade PSI Types of interactions 7. What makes a balloon exhibit an overall positive charge? a. b. c. d. equal protons and electrons in the object more electrons than protons in the object more protons than electrons in the object less electrons in the object 8. What makes an object exhibit an overall negative charge? a. b. c. d. equal protons and electrons in the object more electrons than protons in the object more protons than electrons in the object less electrons in the object 9. What makes an object exhibit an overall neutral charge? a. b. c. d. equal protons and electrons in the object more electrons than protons in the object more protons than electrons in the object less electrons in the object 10. Opposite charges repel. True False 11. Like charges attract. True False 12. As the amount of charge decreases, the electric force between the charges __________. a. decreases b. stays the same c. increases 13. As the amount of distance between charges decreases, the electric force between the charges: a. decreases b. stays the same c. increases www.njctl.org 8th Grade PSI Types of interactions 14. Electric field lines exit positive charges and enter negative charges. True False 15. The electric field strength between two parallel oppositely charged plates: a. Increases as you move towards the positive plate b. decreases as you move toward the negative plate c. remains constant at all points between the plates. 16. William Gilbert was the scientist who discovered that the Earth was a giant magnet. True False 17. Microscopic regions inside iron are called: a. magnetic crystals b. magnetic domains c. magnetic atoms 18. Ferromagnetic substances include: (select all that are ferromagnetic) a. b. c. d. iron aluminum nickel cobalt 19. An electromagnet produces a magnetic field when current flows through it. True False 20. Soft Iron is an example of a(an): a. b. c. d. Electromagnet Temporary magnet Permanent magnet Superconductor 21. Like magnetic poles: a. attract b. repel c. don't interact www.njctl.org 8th Grade PSI Types of interactions 22. This type of field drawing represents: a. attraction b. repulsion c. suspension 23. A test compass at A will be oriented like: A 24. A test compass at B will orient itself like: A B www.njctl.org 8th Grade PSI Types of interactions 25. Magnetic field lines exit from the south pole of a magnet. True False 26. As the distance from a magnetic field source is increased, the magnetic field intensity will: a. Increase b. Decrease c. Stay the same 27. Moving electric charges (electric current) cause a magnetic field to form. True False 28. The __________ rule is the rule that relates the direction of a magnetic field surrounding a wire carrying current. a. b. c. d. left thumb right hand right arm left hand 29. The father of modern electromagnetic theory is: a. b. c. d. Albert Einstein Sir Isaac Newton Michael Faraday Michael Bolton 30. The ________ rule is used to determine the direction of the magnetic field around a current carrying coil of wire. a. b. c. d. right hand left hand right thumb left thumb www.njctl.org 8th Grade PSI Types of interactions Free Response: 31. List the three types of fields discussed in this chapter. What factors affect the strength of each type of field? 32. How can a) a mass, b) a positive charge, and c) a compass be used as field detectors? 33. Explain the process of induction. 34. How do electric field diagrams and magnetic field diagrams compare to each other for attraction/repulsion? Explain your answer in a short paragraph. 35. How is Coulomb's Law (forces between charges) similar/different to Newton's Law of Gravitation (forces between masses)? www.njctl.org 8th Grade PSI Types of interactions 36. Sort the terms below to into the Newton's Law of Gravitation or Coulomb's Law. If they are used for both Laws place the term on the line. Newton's Law of Gravitation Coulomb's Law Mass Attraction Charge Field Repulsion As distance increases force drops www.njctl.org 8th Grade PSI Types of interactions