Forces in Nature

2. created when a wire is coiled around an iron core and an electric current flows through it on an
4. a buildup of electric charge on an object or on part of an object
6. the force that resist motion between two surfaces
7. the force exerted by a magnet
9. changes mechanical energy into electrical energy
13. unlike poles of charges do this
14. a measure of the pull, or force, or gravity on an object
17. an object that has a mass is surrounded by this type of field
19. a machine that converts electrical energy into mechanical energy
20. the total amount of matter in an object

1. the sudden flow of electrons
3. a region of influence around an object
5. the force of attraction that exists between any two or more masses
8. a material through which electrically charged particles can easily flow
10. the two ends or a magnet
11. an object's resistance to change
12. positive and negative charges are this type of charge
15. objects can become electrically charged when an electric field causes parts of an object to become charged
16. a material through which electrically charged particles do not move easily, or sometimes not at all
18. opposite poles or charges do this