Color Absorption and Reflection in Light

1. Absorbed • Taken in • When light hits an object, some colors are absorbed and others are reflected • You only see reflected colors

2. atom • The smallest particle of a substance that has all the properties of that substance.

3. Balanced Forces • Forces that act against each other and do not cause a change in motion. • Object is not moving

4. Battery • A device that changes chemical energy into electrical energy. • Considered Potential energy. • Also called a dry cell

5. Boiling Point • Temperature at which liquid boils and changes from a liquid to a gas. • Boiling point of water is 100° Celsius.

6. Buoyancy • Ability to float

7. Buoyant Force • The upward push of a liquid or gas on an object.

8. Celsius • Metric unit used for temperature • 0° Celsius is the freezing/melting point of water • 100° Celsius is the boiling point of water

9. Characteristic • A feature of a person, plant, animal or object that helps identify it. • Use your 5 senses.

10. Chemical Change • A change that produces a new substance • Examples-- burning paper changes it from paper to ashes.

11. Chemical Energy • Stored Energy • Batteries • Food

12. Chemical Symbol • A one or two letter abbreviation for an elements name • O Oxygen • C Carbon • CO2 Carbon Dioxide

13. Circuit • A compete path of conductors that an electric current can flow through

14. Circuit Breaker • A switch that automatically opens a circuit when too much electricity flows through it • “Blew a breaker”

15. Classify • To group by like characteristics.

16. Compound • A substance whose molecules contain atoms of different elements

17. Concave Lens • A lens that is thinner in the center and thicker at the edges • Bends the light outward • Makes things appear smaller

18. Condensation • The process in which a gas changes into a liquid.

19. Condensation Point • The temperature at which a substance changes from a gas to a liquid

20. Conduct / Conductor • To allow to pass through • Matter that allows energy to pass through it • Metal is a conductor of heat, electricity and magnetism. • Cloth is not a conductor of heat or electricity.

21. Conduction • The movement of heat between two objects that touch each other

22. Convection • The movement of heat energy through liquids and gases in currents

23. Convex Lens • A lens that is thicker in the center and thinner at the edges • Bend light inward • Makes things larger

24. Crest • The highest part of a wave

25. Current (electric) • A constant flow of electrons through a conductor

26. Density • How thick something is.

27. Dissolve • To mix and form a solution with another substance. • Ability to dissolve is called solubility.

28. Electric Charge • A property of matter • Charge can be positive or negative

29. Electric Circuit • A complete pathway of conductors that electrons flow through

30. Electric Current • A complete loop through which electricity can flow. • Called a complete circuit. • Called a closed circuit.

31. Electricity • A form of energy that can move through wires, making it possible to do work.

32. Electromagnet • A temporary magnet created by a flow of electric current around an iron bar

33. Element • A pure substance made of only one kind of atom

34. Energy • The ability to do work. • Causes changes to matter. • Examples: mechanical, chemical, kinetic, potential.

35. Evaporation • The process in which liquid changes to a gas.

36. First Law of Motion • An object at rest will remain at rest, and an object in motion will continue moving in a straight line at a constant speed until an outside force acts on it.

37. Food Energy • A form of energy that is stored in plants and when consumed is converted to energy for animals and humans.

38. Forms of Energy Heat Light Sound Solar

39. Force • A push or pull that causes a change in motion.

40. Freezing Point • The temperature at which a liquid becomes a solid. • Freezing Point of water is 0° Celsius.

41. Friction • A force that acts against motion when two surfaces rub against each other. • Sliding • Drag • Rolling

42. Gas • The state of matter that spreads out evenly to fill a container. • Particles move about freely. • Has no volume?

43. Grams Metric unit used for measuring weight.

44. Gravitation - Gravity • The force that pulls all objects in the universe towards one another. • Makes things fall. • Causes weight

45. Heat • A form of energy that makes something feel warm. • Thermal • Solar • Electrical

46. Inertia • The property of matter that keeps it moving in a straight line or keeps it at rest. • Newton’s First Law of Motion

47. Insulate, Insulator • To block the flow of energy. • Cloth is an insulator of heat. (hot pad) • Rubber is an insulator of electricity. ( an electrician will use rubber gloves or rubber handles)

48. Kinetic Energy • Energy of Motion • Jumping Jacks

49. Light • A form of energy that makes it possible to see. • If you can see something, it either produces light or reflects light.

50. Liquid • The state of matter that takes the shape of its container. • Particles flow past one another. • Has volume.