Download Name ANSWER KEY Date______________ Unit 11 Magnets

Name ANSWER KEY
Unit 11 Magnets Review
Date______________
** Review vocabulary words**
1. What would happen if the north pole of a magnet was held near another north pole?
a. The poles would attract
b. The poles would repel
c. their domains would rearrange
d. they would become demagnetized
2. Where is a magnet the strongest? At the poles
3. Name
a.
b.
c.
three materials that magnets are attracted to.
Iron
Cobalt
Nickel
4. Name
a.
b.
c.
three ways an electromagnet is different from a bar magnet.
Electromagnets can be turned off
The polarity (poles) can change in an electromagnet
You can alter (change) the strength of an electromagnet
5. What is a solenoid?
A coil of wire with an electric current in it
6. Which process occurs when a paper clip is held near a magnet? Explain what
happens to the paper clip.
The paper clip is drawn towards the magnet by the magnetic field. The domains
become aligned and the paper clip becomes a temporary magnet.
7. What are two ways you can increase the strength of an electromagnet?
a. Add a bigger energy source
b. Add more coils
8. Name the four types of magnet and choose two types to describe.
a. Ferromagnet - magnets made of iron, nickel, cobalt or mixtures of these
materials
b. Electromagnet - magnets made by an electric current. These magnets usually
have an iron core.
c. Temporary Magnet - can be created easily, but lose their magnetism quickly.
Ex: soft iron
d. Permanent Magnet - can be difficult to create, but hold their properties
longer. Ex: magnets made with alnico
9. The attraction or repulsion of objects that is generated by moving or spinning electric
charges is known as the
a. magnetic field
b. magnetic force
c. domains
d. magnetic poles
10. How are atoms arranged in a magnet? In a magnet all the atoms (domains) are
aligned (lined up)
11. If a person is running on a track and then trips on a rock and falls, which of
Newton’s Laws best describes this scenario?
Newton’s First Law
12. If the gases of a space ship press down and the space ship flies up, which of
Newton’s Laws best describes this scenario?
Newton’s 3rd Law
13. When electrons flow through a wire it is known as a(n)
a. electric current
b. magnetic field
c. electric force
d. magnetic force
14. Which two factors determine an object’s potential energy?
a. speed and mass
b. speed and velocity
c. mass and height
d. acceleration and speed
15. Label the following in order from strongest magnetic field to weakest magnetic field.
(1 would be the strongest, 2 would be second strongest and 3 would be the
weakest)
a. A wire with electrons flowing through it. 3
b. A coiled wire with electrons flowing through it. 2
c. A wire with electrons flowing through it coiled around an iron core. 1
16. Which type of circuit is used in homes and schools?
a. parallel circuit
b. series circuit
17. Based on your answer above, explain why that type of circuit is used in homes and
schools.
Since parallel circuits allow for openings that don’t affect everything in the circuit, it
is ideal for homes and schools. This way if one light goes out, the rest of the lighting
is unaffected.
18. Label the atom below.
19. Whenever an energy conversion occurs, some of the energy is always converted into
thermal (heat) energy.
20. What energy conversion takes place in an electric motor?
electrical energy to mechanical energy.