Energy Transfer Chapter 9. Energy Transfer Energy is transferred from hotter object to colder object...

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Energy Transfer Chapter 9

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Transcript of Energy Transfer Chapter 9. Energy Transfer Energy is transferred from hotter object to colder object...

Page 1: Energy Transfer Chapter 9. Energy Transfer Energy is transferred from hotter object to colder object Examples? –Cooking pasta –Making ice –Making popcorn.

Energy Transfer

Chapter 9

Page 2: Energy Transfer Chapter 9. Energy Transfer Energy is transferred from hotter object to colder object Examples? –Cooking pasta –Making ice –Making popcorn.

Energy Transfer

• Energy is transferred from hotter object to colder object

• Examples?– Cooking pasta– Making ice– Making popcorn– Roasting marshmallows

Page 3: Energy Transfer Chapter 9. Energy Transfer Energy is transferred from hotter object to colder object Examples? –Cooking pasta –Making ice –Making popcorn.

Three Methods of Energy Transfer

• Conduction

• Convection

• Radiation

Page 4: Energy Transfer Chapter 9. Energy Transfer Energy is transferred from hotter object to colder object Examples? –Cooking pasta –Making ice –Making popcorn.

Conduction• Transfer Energy as heat between particles

in direct contact

• Example– Roasting marshmallow with wire– Air molecules collide with wire

• Transfer energy to wire• Particles in wire move faster, have more E• E then transfer to hand, detect warmth

Page 5: Energy Transfer Chapter 9. Energy Transfer Energy is transferred from hotter object to colder object Examples? –Cooking pasta –Making ice –Making popcorn.

Convection

• Energy transfer through movement of fluids at different temperatures (fluids - liquids and gases)

• Examples– Camp fire

• See soot, embers rise & swirl• Rise upwards – warm air expands

– Why?

Page 6: Energy Transfer Chapter 9. Energy Transfer Energy is transferred from hotter object to colder object Examples? –Cooking pasta –Making ice –Making popcorn.

Convection

• Convection current – flow of fluid due to heated expansion followed by cooling and contraction

• Examples– Fire, candle

• Warm air rises, cools, then flows downward

– Wind current– Boil water in pot

Page 7: Energy Transfer Chapter 9. Energy Transfer Energy is transferred from hotter object to colder object Examples? –Cooking pasta –Making ice –Making popcorn.

Convection

• You can hold your fingers beside the candle flame without harm, but not above the flame. Why?

Page 8: Energy Transfer Chapter 9. Energy Transfer Energy is transferred from hotter object to colder object Examples? –Cooking pasta –Making ice –Making popcorn.

Radiation• Transfer of Energy by electromagnetic

waves

• No movement of matter – will work in vacuum or outer space

• No contact or movement of fluid

• Infrared, visible light, UV rays

• Example– Fire emits radiation (infrared), skin absorbs E,

increase in temperature

Page 9: Energy Transfer Chapter 9. Energy Transfer Energy is transferred from hotter object to colder object Examples? –Cooking pasta –Making ice –Making popcorn.

Energy Transfer from SunEnergy Transfer from Sun

• Electromagnetic energy is a type of energy that is radiated by the sun in the form of transverse waves vibrating at right angles to the direction of movement

Page 10: Energy Transfer Chapter 9. Energy Transfer Energy is transferred from hotter object to colder object Examples? –Cooking pasta –Making ice –Making popcorn.

Radiation occurs in different forms identified by their wavelength

Page 11: Energy Transfer Chapter 9. Energy Transfer Energy is transferred from hotter object to colder object Examples? –Cooking pasta –Making ice –Making popcorn.
Page 12: Energy Transfer Chapter 9. Energy Transfer Energy is transferred from hotter object to colder object Examples? –Cooking pasta –Making ice –Making popcorn.

• WHAT HAPPENS TO ELECTROMAGNETIC ENERGY (RADIATION) ONCE IT REACHES EARTH?

• Radiation is reflected – bounced back at the same angle they arrived

• Radiation is scattered – reflected in various directions

• Radiation is refracted - bent

• Radiation is transmitted – pass through the material

• Radiation is absorbed (taken in as heat energy)

Radiation is reflected – bounced back at the same angle they arrived

Radiation is scattered – reflected in various directions

Radiation is refracted - bent

Radiation is transmitted – pass through the material

Radiation is absorbed (taken in as heat energy)

Page 13: Energy Transfer Chapter 9. Energy Transfer Energy is transferred from hotter object to colder object Examples? –Cooking pasta –Making ice –Making popcorn.

Radiation

• Radiation can be absorbed and emitted

• Color– Summer day: wear light or dark clothes?– Winter day: wear light or dark clothes?– Why?


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