Forces Review

3. these types of trains use magnets to reduce friction
6. a force that pulls objects with mass toward each other
7. these are associated with electrical force and are positive or negative
9. The combination of all forces acting on an object.
13. this law states that the force of gravity acts on all objects in the universe
15. objects falling through the air experience this as they fall
16. These types of forces do not need to touch to exert force.
17. this law gives us the formula for acceleration
18. speed in a given direction
19. the state in which one object's distance from another is changing
21. this law states for every action there is an equal an opposite reaction
22. These forces can cause an object to speed up, slow down, or change direction.
23. This is the unit that forces are measure in.

1. this is a type of friction that occurs when an object goes through a liquid or gas
2. the force of gravity on a person is measured in this
4. any object that orbits around another object in space
5. an objects tendency to resist a change in motion
8. in order to determine if you are moving you would need one of these to compare yourself to (a tree while driving)
10. this law of motion states an object at rest will stay at rest unless acted upon by a balanced force
11. this is a contact force that occurs when two objects rub together
12. These types of forces much touch to exert force.
14. Equal forces acting on one object in opposite direction
19. the amount of matter in an object. This does not change
20. these objects have north and south poles