BM3 Review

2. two things rub against one another; slows or stops; opposite of applied force
5. eats dead plants and animals
9. energy sources that can be quickly refilled such as solar energy, wind energy, and geothermal energy
13. energy of motion; increases based on mass
14. physical property of water
16. Protons and neutrons make this up
18. eats other animals for energy
19. Large subatomic particle with a positive charge; found in the nucleus
20. takes up space, made of atoms
21. what the scientist changes or manipulates
22. molecules tightly packed and organized; set shape and volume

1. type of car that pollutes the air less than a gasoline-powered car
3. allows molecules to enter and exit the cell
4. molecules spread out to fill container, no set shape or volume
6. water changes from water vapor to a liquid, like on a mirror after a shower
7. stored energy; increases depending on objects position
8. the formula is distance divided by time
10. smallest subatomic particle with a negative charge; circles nucleus
11. molecules roll over one another but are still touching, takes shape of container
12. something new is made indicated by fire, rust, smell, color change, or fizz
15. create their own energy from the Sun
16. Large subatomic particle without a charge; found in the nucleus
17. Forces that pulls things down to the center of the Earth and acts on all objects at all times