1. Electric and Magnetic Forces

2. Types of Forces
Friction
Static
Sliding
Air Resistance
Gravity
Electric
Magnetic

3. Background
All materials contain electrical charges.

4. Background
• However, friction (rubbing materials together) can transfer negative charges from one material to another

5. Background • Some materials are better than others at:
- Becoming positive, such as:
Human hair
Wool
Cat fur
- Staying neutral such as:
Cotton
Steel
Becoming negative, such as:
Copper
Latex
Polyester
Styrofoam

6. Electrical Forces
• Objects that carry a positive (+) or negative (-) charge can exert (create) electrical forces

7. Electric Forces
Electric Force = an attractive pull or a repulsive push between two electrically-charged objects + - - - - - - + + +
Repulsive push
Attractive pull

8. Electric Forces
• When charges are alike, objects will repel and move away
• Objects with opposite charges, will attract and move towards
one another

9. Types of Forces
Friction
Static
Sliding
Air Resistance
Gravity
Electric
Magnetic

10. Magnetic Forces
Magnetic Force = an attractive pull or a repulsive push between two magnets
A magnet is any material that can generate magnetic forces.

11. Magnetic Forces Not all materials/metals are magnets.
Some materials that ARE magnetic are:
Iron
Nickel
Cobalt
Neodymium
All magnets have a North and South pole

12. Magnetic Forces
Magnets with opposite poles (N-S) will always attract and move together
When the poles are alike (N-N) or (S-S), magnets will repel and move away

13. Electric Forces vs. Magnetic Forces
Sometimes electric forces are mistaken for magnetic forces because the interactions are so similar.
However, the behaviors are happening for different reasons.