Attraction and Repulsion
Magnetic Fields and field Lines
Random
Identify the Independent and Dependent Variables
100
What are happening to the magnets in this picture?
They are repelling.
100
Please draw the magnetic field lines that two attracting magnets would have.
The magnetic field lines would connect to each other.
100
In the Science Seminar, which claim and design did most people agree with that was the best?
Nevi's Claim
100
A student uses magnets of different strengths and observes how far a paper clip is pulled.
What is the independent variable?
Different strengths of the magnet
200
What advantage does an electromagnet have over a permanent magnet?
An electromagnet can be used for picking up more metals.
An electromagnet can be switched off.
An electromagnet is lighter.
A permanent magnet cannot be used to pick up nickel.
An electromagnet can be switched off.
200
Does Dorian's Design have attracting, repelling magnets, or both attracting and repelling in her design?
Both attracting and repelling magnets.
200
In Evidence Card F, did Magnet 1 have loose wire coils or tight wire coils?
Loose wire coils
200
A student changes the distance between two magnets and measures the force between them.
What is the independent variable?
The magnetic force
300
It was observed that a pencil sharpener gets attracted by both poles of a magnet although its body is made of plastic. Name a magnetic material that might have been used to make some part of it.
Steel or Iron
300
Are these magnets attracting or repelling?
The magnets are attracting.
300
In the Science Seminar we just completed we looked at different roller coaster designs and evidence cards. On Day 1, we were able to get rid of Evidence Card B and D. Why did we get rid of these two Evidence Cards?
The Variables were not isolated.
300
A student moves a compass to different locations around a bar magnet and records how much the needle deflects.
What is the dependent variable?
Compass needle deflection
400
At which point is the effect of a magnet the strongest?
It is strongest at the poles of the magnet
400
Fill in the blank with either North to South or South to North.
Outside the magnet, lines point from ____________; inside, they go from ______________.
North to South, and South to North.
400
In Dorian's Design, how many centimeters away was the launcher magnet block to the projectile magnet car.
It was 7 centimeters away.
400
A student investigates how distance affects magnetic force. The student keeps the magnet type the same, changes how far apart the magnets are, and measures the acceleration of a cart attached to one magnet.
What is the independent variable?
Answer: Distance between the magnets
What is the dependent variable?
Answer: Acceleration of the cart
500
Word Bank: Magnetic, North, South, Permanent, Iron, Magnetic Field Lines, current, electromagnets, electric battery
When using a compass, it points to the _________ because the indicator has a tiny magnet which aligns with the Earth's magnetic field and also will align with a _______ magnet's _______ pole.
North, Permanent, North
500
Please draw on the board what direction the magnets were in on Nevi's Design. (Were they all repelling, all attracting, both repelling and attracting?)
All repelling magnets
500
Magnet A Magnet B
N S ← d → S N
|-----| |-----|
Two bar magnets are placed so that like poles (S–S) face each other and are separated by a distance d. Magnet B is slowly pushed closer to Magnet A, decreasing the distance to ½d, and then held in place.
Which statement best describes what happens to BOTH the magnetic force and the magnetic potential energy of the system? Explain your reasoning.
A. The magnetic force decreases; the potential energy decreases
B. The magnetic force increases; the potential energy increases
C. The magnetic force increases; the potential energy stays the same
D. The magnetic force stays the same; the potential energy increases
B
Like poles repel, and repulsion gets stronger when magnets are closer
More work is required to push the magnets closer together
That work is stored as magnetic potential energy
500
A student investigates how magnetic field strength affects compass behavior. The student changes the current in an electromagnet, keeps the compass at a fixed distance, and measures the angle the compass needle turns.
Independent variable: Current in the electromagnet
Dependent variable: Angle of compass needle deflection