Contact vs. Non-contact
A push or pull on an object
Force
This is the area around a magnet where its force can be felt.
A magnetic Field
This is a region where an object can exert a force on another object without touching it.
A Field
Anything with a motor is an example of this type of magnet. Name an example
Electromagnet Ex: Washing machine, Car window
Protons have this really happy charge
positive
This force resists motion between two surfaces rubbing together.
Friction
This happens when opposite poles of two magnets are brought near each other.
They Attract
These are the two ends of a magnet where the magnetic force is strongest.
The North and South Poles
This must flow through a wire to create an electromagnet.
Electric current
A charged object is moved farther away from another charged object. This happens to the electric force between them.
It decreases
A charged balloon sticks to a wall. Identify the force and type.
Electrostatic force (non-contact)
Some students think all magnets attract each other. This describes what happens when two like poles are brought together.
They repel.
This explains why fields get weaker as you move farther away from the source.
The increase in distance reduces the force exerted by the field
# of loops, # of electrons, insert an iron core, do this thing to an electromagnet
Increase the strength
Static Charge can be created by friction, induction, and this other method that occurs when a charged object touch a neutral object.
Conduction
Compare contact vs. non-contact forces in one sentence.
Contact forces require touching, while non-contact forces act at a distance
Two identical magnets are placed side by side. This location would experience the strongest magnetic force.
near the poles (especially where opposite poles are closest)?
This field is responsible for wireless energy transfer and includes both electric and magnetic components.
an electromagnetic field
All of these line up when an item is magnetized.
Magnet Domain
The separation of charge on the surface of an object caused by the electric field without the two objects touching each other.
Induction
A box is sliding across the floor after being pushed. It eventually slows down and stops. At the same time, Earth is pulling on the box the entire time.
Explain which forces are acting on the box, classify each as contact or non-contact, and describe how they interact to change the box’s motion
friction (contact force) slows the box down, and gravity (non-contact force) pulling it downward, while the normal force balances gravity. Friction causes the box to lose motion and stop.
A compass is placed near two magnets on a table. One magnet’s north pole faces the compass, while another magnet’s south pole is closer but off to the side.
Predict how the compass needle will point and explain why.
needle aligning with the stronger nearby magnetic field, so it will point toward the closer/stronger pole (likely the nearby south pole)
a space around a charged particle where the particle exerts electric force on other charged particles.
an electric field
The difference between a regular magnet and an electromagnet is these 4 things
Use electricity, you can flip the poles, turn it on and off, and change the strength
A balloon is rubbed on hair and then sticks to a neutral wall.
Explain how electrostatic forces cause this interaction.
The charged balloon rearranges charges in the wall, creating an attractive force due to opposite charges.