Science Review

1. a wave in which particles move in the same direction of energy transfer
6. an element that has some metallic and some nonmetallic properties
7. a contact force that two surfaces exert on each other when they push or rub against each other
9. a change that alters the form or appearance of matter but does not form any new substances
10. a law that states if one object exerts a force on another object, then the second object exerts an equal but opposite force on the first object
14. mixture made of parts that are easily identified and can be separated
17. a law of physics that states that energy cannot be created or destroyed but can be transferred or transformed from one form to another
18. the material through which a wave travels
20. energy due to the position of an object or its shape
23. change a change in matter that produces one or more new substances
24. two forces acting on the same object that are equal in strength and opposite in direction
26. the basic unit of matter
27. a change that results in the formation of one or more new substances
28. an element that is a good conductor of heat and electricity
29. law of motion stating that the amount of force applied to an object is equal to the product of the object’s mass and its acceleration

2. two forces acting on the same object that are not equal in strength and opposite in direction
3. a non-contact force that pulls objects with mass toward each other
4. law of motion stating that a body at rest will remain at rest, and a body in motion will remain in uniform motion, unless acted upon by an external force
5. the sum of an object’s energy in motion (kinetic energy) and its stored energy (potential energy)
8. mixture made of substances so evenly mixed that it is difficult or impossible to see the individual substances
11. energy of motion
12. substance that contains only one type of atom and cannot be broken down into a simpler form
13. a wave in which particles move perpendicular to the direction of energy transfer
15. sum of all forces acting on an object, taking into account their strength and direction
16. a chart that organizes all known elements according to patterns in their properties
19. substance substance that consists of just one type of particle and is the same throughout
21. an element that is a poor conductor of heat and electricity
22. a disturbance that transfers energy from one place to another
25. two or more atoms joined by chemical bonds