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 CO 2 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.

51. Magnetism A force that attracts or pushes away matter.

52. Mass Amount of matter in an object. Measured in grams. Stays the same everywhere. On Earth, mass and weight are the same. My Average Size Spacesuit.

53. Matter Anything that has mass and takes up space.

54. Melting Point Temperature at which a solid melts. Temperature at which a solid becomes a liquid. Melting Point and Freezing Point are the same temperature. Water is 0° Celsius.

55. Mixture A combination of two or more substances in which each substance keeps its original characteristics. Can be easily separated. Examples: Salad, Chex Mix

56. Molecule A grouping of two or more atoms joined together Example: H 2 O = water Non-living things are made of atoms

57. Motion The act of changing place or position.

58. Opaque Does not allow light to go through. Cast a shadow.

59. Physical Change Changes to appearance. Does not change what the substance is. Examples: melted chocolate

60. Physical Science The study of matter and energy. Objective 2 on the TAKS Test. 9 questions

61. Physical States of Matter 3 states of matter Solid, Liquid, Gas

62. Pitch vs. Volume Pitch is the highness or lowness of sound. Depends on the frequency of sound waves Volume is soft or loud

63. Potential Energy Energy of Position Standing still Stored energy Gravity

64. Property Similar to characteristics A characteristic you can see, feel, smell, hear or taste. (5 senses) Examples: color, size, shape, odor, or texture.

65. Reflection A wave that bounces back off an object. Mirror

66. Refraction The act of bending light as it passes through something. Changes direction and speed. Slows the light. Appears broken.

67. Second Law of Motion An object’s acceleration (speeding up) depends on the size and direction of the force acting on it and on the mass of the object.

68. Solar Energy A form of energy from the Sun. Produces, heat and light energy

69. Solid The state of matter that has a definite shape. Keeps it shape no matter what the container. Particles packed tightly together. Has Mass and Volume.

70. Solubility The ability to dissolve. Salt is soluble in water. Sand is not soluble in water.

71. Solution Special type of mixture. One substance dissolves into another. Examples: Sugar in tea, lemonade

72. Sound Caused by vibration. Travels in waves. Pitch vs. Volume

73. Suspension A mixture where one substance floats in another. Examples: cereal floating in milk

74. Temperature The average kinetic energy of all the molecules in an object. The higher the average the kinetic energy, or the faster the molecules move, the higher the temperature.

75. Thermal Energy Energy from heat. HEAT MOVES!!

76. Third Law of Motion For every action, there is an equal and opposite reaction

77. Transmit - Transmission Allows energy to pass through. Similar to Conduction. Metal transmits heat.

78. Transparent Clear. Allows light to pass through. Transparencies

79. Translucent Allows some light to pass through Wax Paper

80. Volume How much space something takes up. L x W x H

81. Weight Measure of the force of gravity on an object. Measured in newtons. Not the same everywhere.