Magnetic Fields
Earth as a Magnet
Electromagnets
Wild Card (Random U1-8 Questions)
Wild Card (Random U1-8 Questions)
100
What direction do magnetic field lines point?
a. N -> S
b. S -> N
c. S -> S
d. N -> N
a. N -> S
100
Name the piece of equipment that is used for navigation using the Earth’s magnetic field.
Compass
100
What three factors affect the strength of an electromagnet?
Number of coils, current, type of core
100
What are the three components of blood?
Red blood cells, white blood cells, plasma
100
When a liquid or gas diffuses it moves from an area of _________ to __________ concentration.
High to low concentration
200
What is a magnetic field?
a. An area where you can use a magnet
b. An area where magnetism can be detected
c. An area to store magnets
d. An area where no magnets are allowed
b. An area where magnetism can be detected
200
What part of Earth’s structure is believed to be the cause of Earth’s magnetic field?
The core, because it contains molten iron
200
What is one real-world use of electromagnets?
Used at scrapyards to lift objects made of magnetic metals
Speakers / Headphones
Electric locks
Motors
200
What is one factor that affects solubility?
Temperature
200
When white light passes through a triangular prism it is dispersed (split into components colors). What are the 7 colors it is split into?
ROYGBIV
Red Orange Yellow Green Blue Indigo Violet
300
What 3 metals are magnetic?
Nickel, iron and cobalt
Steel is an alloy or iron, so it is also magnetic
300
True or false:
The Earth magnetic poles are slowly moving at a speed of about 60km each year.
True
300
True or false:
Unlike permanent magents, electromagnets don't have a North and South pole?
False, they have poles just like a permanent magnet
300
When light bends due to changing speed as it goes from one medium to another, this is called...
Refraction
300
Where does gas exchange occur? Be specific, where in the lungs does it occur.
Alveoli (air sacs)
400
Identify all 4 poles on the 2 magnets.
From left to right:
S, N, N, S
400
Where is the Earth's magnetic fields the strongest?
Near the magnetic poles
400
For your practical you investigated how certain factors affect the strength of an electromagnet. What was the dependent variable in the experiment?
The strength of the magnet (how many paperclips it raised)
400
What is the difference between weather and climate?
Weather is the short-term state of the atmosphere. Climate is the long-term pattern of the weather.
400
What are the three macronutrients?
Carbohydrates, Protein, Fat
500
If you were to place plotting compasses around a bar magnet, which directions would they point?
A - the compasses point in the direction of the field lines; away from the North pole and towards the South pole
500
Draw Earth as a giant magnet, including the arrows for your lines. Remember Earth’’s geographic north is actually a south pole for a magnet.
500
An electromagnet with 20 turns was able to lift 3 paper clips. How many paper clips do you expect it can lift if the number of turns is increased to 60?
9 paper clips
500
A 100N force is applied over an area of 5m2. Calculate the pressure.
P = F/A
P = 100N / 5m2 = 20 N/m2 (Pa)
500
Qingfu has a weight of 500N and sits 2 meters from the pivot on a see-saw. Calculate his moment.
M = Fd
M = 500N x 2m
M = 1000Nm