1. Why aren’t the paperclips attracted to the magnet?
The paperclips are outside the magnetic field.

2. What type of magnet is shown here?
Electromagnet

3. What materials would you need to create an electromagnet?
Copper wire
Battery
Iron nail

4. The copper wire coiled around an iron nail in an electromagnet.
What is a solenoid?
The copper wire coiled around an iron nail in an electromagnet.

5. Name three ways to increase the strength of the electromagnet shown here.
Increase the battery (voltage)
Increase the number of coils
Increase the size of the iron core (nail).

6. Which of the following exerts a force?
BOTH!

7. What happens if a magnet moves back and forth within a coil of wire?
A current will be produced and reverse direction.

8. What happens if a wire is moved between the poles of a magnet?
An electric current is produced.

9. The magnets will move apart (repel).
What would happen if the magnets shown below are pushed towards each other?
The magnets will move apart (repel).

10. What is the difference between a bar magnet and an electromagnet?
A bar magnet is permanent. The electromagnet is temporary and can be turned off.

11. What is the relationship between mass and gravitational force?

12. The gravitational force will decrease.
Two objects of the same mass are shown below. What will happen to the gravitational force between the two if distance between them is increased?
100 kg
100 kg
The gravitational force will decrease.

13. The mass of the objects and the distance between them.
What does the magnitude of gravitational force between two objects depend on?
The mass of the objects and the distance between them.

14. What causes the objects to fall to the ground?
Gravity

15. If you rub a balloon on your hair, how do both become electrically charged? What will happen if you hold the balloon close to your hair?

16. What is the difference between an insulator and a conductor?

17. What is charging by induction?
a method used to charge an object without actually touching the object to any other charged object.

18. A further example

19. Which of the following statements is true?
Positive charges can move
Negative charges can move
Both positive and negative charges can move

20. A discharge of excess electrons from his hand to the door knob.
What caused John Travoltage’s shock after he rubbed his foot on the carpet?
A discharge of excess electrons from his hand to the door knob.

21. Why do clothes in a clothes dryer build up static and stick to each other?
Friction (the clothes rub together in the dryer).