1. Retake Test

2. Scenario
Brian wakes up one morning, and sluggishly walks to the bathroom. Since he is really tired he drags his feet as he walks.
When he goes to open the bathroom door, the door handle shocks him! What the heck??

3. Question 1:
What is the cause and effect of what happened when Brian touched the doorknob?
The shock came from the energy and electricity found in the metal of the doorknob.
The shock came from the stored up electrons jumping from Brian’s hand to the doorknob.
The shock came from the stored up protons jumping from Brian’s hand to the doorknob.
The shock came from protons and electrons jumping from Brian’s hand to the doorknob.

4. Scenario
When Brian got into the bathroom he combed his hair so it didn’t look so wild. As he went to rinse his comb off he noticed that when he brought his comb close to the water, the water bent and came closer to the comb.

5. What is the science behind this crazy phenomenon?
Question 2:
What is the science behind this crazy phenomenon?
Friction is a force that always acts opposite of the direction of motion.
B. Gravity is always present on Earth no matter where you go.
C. Some forces can act at-a-distant, without objects touching.
D. The Earth’s north pole is actually the magnetic south pole.

6. Question 3:
Draw a model, labeling the protons and electrons, of the comb and the hair as they are being attracted to one another.

7. Question 4: Which graph represents the electric force between the water and comb compared to how far away the comb is? A B C

8. Scenario
Brian goes to the dryer to get clean clothes to put on for school. When he opens the dryer, he finds all the clothes stuck together.

9. Question 5:
What could be causing all of the clothes in the dryer to be stuck together?
The dryer’s electricity transferred protons to the clothes and made them stick together with static.
The shirt got charged up with electrons from being in the dryer so it had a static charge.
The clothes gave up all their protons and became electrically charged.

10. Scenario
Brian has to pay some fees at school and so his mom lets him take her credit card. She really trusts him! When Brian takes it to the office, their computer is down so they can’t read the credit card.

11. Question 6:
What does this tell us about the computer in comparison with the credit card?
The computer is a permanent magnet because it can be turned on and off.
The credit card is an electromagnet because it can’t be used without a computer.
The computer is an electromagnet because it only works when it is turned on.
The credit card doesn’t use magnets, but uses static electricity to work.

12. Scenario
Brian sprints to science class, because the whole computer outage is going to make him late to his favorite class.
When he gets there his class is doing an experiment where they are making their own electromagnets.

13. Material Iron 50 15 17 12 Steel 9 6 8 Number of Coils Power
Number of Staples Picked up
Iron 50
AA Battery 15 17 12
Steel 9 6 8

14. What is the independent variable in the experiment?
Question 7:
What is the independent variable in the experiment?
Material
B. Number of Coils
C. Power
D. Number of Staples Picked Up

15. What is the dependent variable in this experiment?
Question 8:
What is the dependent variable in this experiment?
Material
B. Number of Coils
C. Power
D. Number of Staples Picked Up

16. Question 9:
Based on the data from the experiment, what claim can we make about the experiment?
The number of coils affects the number of staples the electromagnet picks up.
B. The type of material affects the number of staples the electromagnet picks up.
C. The amount of power affects the number of staples the electromagnet picks up.
D. The brand of staples affects how many are picked up by the electromagnet.

17. Question 10:
The magnet on the right has magnetic field lines drawn on it. Where would the magnet be the strongest based on the magnetic field lines? A B C D