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Energy, Waves, Light and Sound Chapter 3: ENERGY New Notes 3.1: Energy exists in Different Forms 1 Energy, Waves, Light and Sound


  1. Energy, Waves, Light and Sound Chapter 3: ENERGY New Notes 3.1: Energy exists in Different Forms 1

  2. Energy, Waves, Light and Sound �����������€������������������������������€����� �� ���������� ���������������������� ���������������� ��������������€����������€������������������� ����� ������� ���€��������������������� ������ �������� ��������������������� �–����������� ��������������������� ������������ �–�������������������� ���������� �–���������������������� 2

  3. Energy, Waves, Light and Sound ��������������€����������€�������� �������������������� ������������������������ ����������������…� Energy Form Description Example or Use Mechanical Energy that moves object Turn a car key Sound Vibrations in the particles of a solids, Singing, laughing liquids or gasses Cannot travel through empty space Chemical Energy stored in the structure of Food, gasolineWood (burn to matter use) Thermal(heat) Total amount of energy from the HEAT movement of particles that make up matter Electromagnetic Transmitted through empty space in Visible light, x­rays, gamma (waves) the form of waves. rays, microwaves, radio waves Nuclear The energy stored in the nucleus of an Sun­ fusion (put together) of 2 atom nucleiFission break apart the nucleus of an atom 3

  4. Energy, Waves, Light and Sound ���������������������� ���������������€������� ��€��€����������� �������€������������� �������������������� ������������� ����������������������������� ��������������������� ��������€���������� ��������� �������€��� ���� ���������� ���������€���������� ��������� ����� ����� � ����������� 4

  5. Energy, Waves, Light and Sound �����€��€������������� � ����������� ������������������������������ ���������������������������� ������������� 5

  6. Energy, Waves, Light and Sound ��������������€���������������€���������� €���’�����������������€��������������������� ����� ������������€����������€��������€�� ��������������������� ������€����€������� Home Work : Monday: 3.2 Reading Study Guide and pg 83 1­4 Tuesday: Study For 3.2 Quiz Wednesday:3.2 Quiz , Read Study Guide 3.3 Thursday: Study for 3.3 Quiz Friday: Study for 3.3 6

  7. Energy, Waves, Light and Sound New Notes 3.2: Energy Can Change Form But is Never Lost. A. The Law of Conservation of Energy States that energy can not be created or destroyed it is transferred into another form . 7

  8. Energy, Waves, Light and Sound B. Kinetic energy can be converted into potential and potential energy can be converted back into kinetic energy 8

  9. Energy, Waves, Light and Sound C. Energy Efficiency is the measurement of usable energy after an energy conversion has taken place. 9

  10. Energy, Waves, Light and Sound Review 3.2: A. The measurement of usable energy after an energy conversion is ________________ . B. Energy _______________________ may produce __________________ forms of energy. For example the shaking of a fan (kinetic energy) or heat energy C. Describe the motion of a roller coaster. When is there max. potential, max kinetic and what conversions take place . 10

  11. Energy, Waves, Light and Sound n Review 3.2: A. The measurement of usable energy after an energy conversion is energy efficiency . B. Energy conversions may produce unwanted forms of energy. For example the shaking of a fan (kinetic energy) or heat energy 11

  12. Energy, Waves, Light and Sound WAVES, LIGHT, SOUND 1.1 Vocabulary: Wave A disturbance that transfers energy Medium material that a wave travels through (earth, water, air, rope etc) Mechanical Wave waves that transfer energy through matter. Ex: sound, water, earthquake Transverse Wave Wave travels up and down or left to right. Ex. ocean wave. Wave travels perpendicular (at right angles) to the disturbance. Longitudinal Wave The wave travels back and forth in the same (compression waves) direction as the disturbance. Ex. sound waves 12

  13. Energy, Waves, Light and Sound 1.2 Vocbulary Crest The highest point on a wave Trough The lowest point on a wave Amplitude The distance a medium moves above or below its resting point Wavelength the distance from one crest or trough to the next crest or trough Frequency the number of wavelengths passing through a fixed point in a certain amount of time. Frequency determines the pitch of a sound wave Reflection The bouncing back of a wave after it strikes a barrier Refraction The bending of a wave as it enters a new medium at an angle other can 90 degrees. Diffraction The spreading out of waves as they pass through an opening or around the wedges of an obstacle. Interference The meeting and combining of waves. Adding or subtracting of waves amplitudes. 13

  14. Energy, Waves, Light and Sound Sound sound is a longitudinal wave that is produced by a vibrating object that travels through nature Vibration a rapid back and forth motion Vacuum is empty space. Light can travel through a vacuum, sound can not. Pitch The quality of highness or lowness of a sound determined by the waves frequency Electromagnetic Waves A wave that does not require a medium to travel travel (can travel through empty space). Examples: radio, light, gamma, microwaves, ultra violet, visible light Radiation energy that travels across distances in the form of electromagnetic waves Bioluminescence The production of light by living organisms. Luminescence The production of light without the high temperature needed for incandescence 14

  15. Energy, Waves, Light and Sound Lense is a clear optical tool that refracts light Concave Lense light rays will spread out Convex Lense light rays bend and meet at a focal point Waves transfer energy A wave is a disturbance that transfers energy from one place to another Forces are required to change the motion of an object. Therefore forces are required to make disturbances and cause a wave. 15

  16. Energy, Waves, Light and Sound Rope Wave: when you pull on a rope it send a wave through the rope Water Wave : Dip your finger or foot into the water it makes a ripple, which is a wave traveling through the water 16

  17. Energy, Waves, Light and Sound Earthquake Wave : When plates in the earth crust move, the sometimes push and pull on each other, causing energy to be released. That energy travels as an S or a P wave. As waves move through the ground the energy causes the earth to shift and shake. Waves are also classified based on how they move. They can move up and down or side to side ( Transverse Waves) or they can move back and forth ( Longitudinal Wave). 17

  18. Energy, Waves, Light and Sound Parts of Waves: 18

  19. Energy, Waves, Light and Sound Mediums: Many waves must travel through a substance called a medium . When waves pass through different mediums sometimes it can change the wave. The medium often determines how a wave behaves . 19

  20. Energy, Waves, Light and Sound REFRACTION: Certain mediums can slow down a wave, or speed up a part of a wave causing the wave to bend or refract . For example when light wave pass from air into water, the wave slows down and bends or REFRACTS , distorting the image that we see. REFRACTION: BENDING 20

  21. Energy, Waves, Light and Sound REFRACTION: BENDING LENSES : Sometimes we use a LENS to refract ( BEND ) light on purpose. 21

  22. Energy, Waves, Light and Sound A Concave Lens: produces a smaller image Concave Lens can "Shrink the image" 22

  23. Energy, Waves, Light and Sound A Convex Lens: magnifying glass, can invert (make upside down) the image or make the image appear larger like a magnifying glass 23

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