Question

Question 17
The source of all magnetism is:

a
tiny pieces of iron
b
ferromagnetic material
c
moving electric charges
d
tiny domains of aligned atoms
Question 18
Every magnet, regardless of its shape, has two

a
magnetic poles
b
magnetic fields
c
magnetic charges
d
magnetic needles
Question 19
According to Coulomb's Law, when the distance between two particles increases, the electrostatic force _____.

a
decreases
b
has no relationship to distance
c
increases
d
remains unchanged
Question 20
The Coulomb is the SI unit for:

a
Charge
b
Work
c
Distance
d
Force

Question 22
Increasing the number of coils in an electromagnet will cause the strength of the magnetic field to decrease.

True
False
Question 23
An electric current produces a(n):

a
insulator
b
solenoid
c
magnetic field
d
magnet
Question 24
Mrs. Hankinson made the following electromagnet. What is the most likely explanation for the failed experiment?



a
The electromagnet needs a switch
b
The wire was not connected properly
c
The metallic objects lost their magnetic domains
d
The battery is too low voltage to work
Question 25
When the North Pole of one magnet is held close to the South Pole of another magnet, the two magnets will:

a
do nothing
b
attract
c
repel


Question 27
Taylor says he likes using simple machines because they do his work for him. Alicia says that simple machines only help do the work, but do not do the work for you. Which best describes who is correct?

a
Taylor is correct because simple machines are always used without anyone touching them.
b
Alicia is correct because simple machines use electricity to help perform jobs.
c
Taylor is correct because simple machines are always used in factories and don't require work.
d
Alicia is correct because simple machines change the amount of work required, but still require work.
Question 28
A rock is taken from the Moon back to Earth. Which of the following correctly describes the changes to its mass and weight?

a
Its mass decreases, and its weight has no change.
b
Its mass has no change, and its weight increases.
c
Its mass has no change, and its weight decreases.
d
Its mass increases, and its weight increases.
Question 29
If an object has a mass of 20 kg on a planet with a force of gravity of 4 m/s2. What is the object's weight?

**Remember** W=mg

a
200 N
b
5 N
c
80 N
d
0.2 N
Question 31
Why does a girl skateboarding on a half-pipe not remain in motion forever?

a
her energy is destroyed by the friction of the skateboard and the concrete
b
her energy is transformed into thermal energy from friction
c
her energy is used up
d
none of the above

Answer 1

Here are the answers to your questions:

**Question 17**: The source of all magnetism is:
**c** moving electric charges

**Question 18**: Every magnet, regardless of its shape, has two:
**a** magnetic poles

**Question 19**: According to Coulomb's Law, when the distance between two particles increases, the electrostatic force _____.
**a** decreases

**Question 20**: The Coulomb is the SI unit for:
**a** Charge

**Question 22**: Increasing the number of coils in an electromagnet will cause the strength of the magnetic field to decrease.
**False**

**Question 23**: An electric current produces a(n):
**c** magnetic field

**Question 24**: Mrs. Hankinson made the following electromagnet. What is the most likely explanation for the failed experiment?
**b** The wire was not connected properly

**Question 25**: When the North Pole of one magnet is held close to the South Pole of another magnet, the two magnets will:
**b** attract

**Question 27**: Taylor says he likes using simple machines because they do his work for him. Alicia says that simple machines only help do the work, but do not do the work for you. Which best describes who is correct?
**d** Alicia is correct because simple machines change the amount of work required, but still require work.

**Question 28**: A rock is taken from the Moon back to Earth. Which of the following correctly describes the changes to its mass and weight?
**c** Its mass has no change, and its weight increases.

**Question 29**: If an object has a mass of 20 kg on a planet with a force of gravity of 4 m/s². What is the object's weight?
Using \( W = mg \): \( W = 20 \, \text{kg} \times 4 \, \text{m/s}^2 = 80 \, \text{N} \)
**c** 80 N

**Question 31**: Why does a girl skateboarding on a half-pipe not remain in motion forever?
**b** her energy is transformed into thermal energy from friction

Let me know if you need further assistance!