Transcript Potential Energy

Types of Energy!
What is energy?
• Energy is the ability to cause change (or to do work)
Kinetic Energy
• Kinetic Energy is the
energy an object has
because of its
motion.
• Depends on the
object’s speed and its
mass.
Potential Energy
• Potential Energy is
the energy stored in
an object because of
its position/height.
• Depends on its
height/position and its
mass.
Roller Coasters!!
• At the top of the first
and tallest hill, the car
has the greatest
potential energy.
• This potential energy is
transformed into kinetic
energy as it races
down the hill.
Thermal Energy
• All objects have
thermal energy
(heat), which,
increases as the
temperature
increases.
• Which has more
thermal energy…a
block of ice or a cup
of water?
Radiant Energy
• The energy carried by
light is called radiant
energy.
• When radiant energy is
absorbed it can become
thermal energy (like a
black jacket on a hot day)
• Name 3 objects that
have radiant energy….
Electrical Energy
• Electrical energy is the
energy carried by
electric current (created
by electrons moving
from atom to atom in a
flow).
• Power plants generate
electrical energy.
• How do these power
plants generate
electricity?
Chemical Energy
• Chemical energy is the
energy stored in chemical
bonds.
• Examples:
– Food (ex. photosynthesis)
– Fuels (ex. natural gas, oil,
coal)
Nuclear Energy
• Nuclear energy (also
called atomic energy) is
the energy within the
nuclei of atoms.
• Nuclear energy is
released by the splitting
(fission) or merging
together (fusion) of the
nuclei of atom(s).
• It is nuclear fission that we
use as a power source to
give us nuclear power.
Playing Basketball…
• When dribbling a
basketball, what types
of energy does the ball
have and how do they
change throughout the
movement?
Classwork / Homework
Answers
Workbook – C13, S1
• “Before you read” – answers will vary
• Highlight / UnderlineText – check for
completion
• 1. – A slower moving object has less kinetic
energy; an object with less mass has less
kinetic energy also
• 2. – The top vase will have more potential
energy; potential energy is affected by position
(height) and mass
• 3. – greatest thermal energy = hot coco
- least thermal energy = ice
Classwork / Homework
Answers
Workbook – C13, S1
• 4. – Food has stored chemical energy that our
bodies use.
• 4. continued… Food’s chemical energy comes
from the food chain which is started through
photosynthesis where radiant energy from the
sun is transformed into chemical energy for
fuel.
• 5. When an object absorbs light energy, the
object gets warmer (like a black shirt on a hot
day in the sun)
• 6. – 220V electrical outlet
Classwork / Homework
Answers
Workbook – C13, S1
• 1. – Potential energy is stored energy relating
to its position and depends upon its height and
mass. Kinetic energy is the energy of motion
and depends upon the object’s speed and
mass.
• 2 – potential energy = book on a shelf
•
•
•
•
•
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Kinetic energy = a ball rolling
Electrical energy = the energy that makes a TV work
Thermal energy = the energy in a hot cup of tea
Chemical energy = the energy in food
Nuclear energy = the energy in an atom’s nucleus
Radiant energy = a lamp giving off light
Classwork / Homework
Answers
Worksheets – C13, energy (pg. 17)
• 1. power plants
• 2. solar/light
• 3. food and fuel
• 4. nuclear
• 5. magma
• 6. light/solar
• 7. position
Classwork / Homework
Answers
Worksheets – C13, energy (pg. 25)
• 1. Energy is the ability to cause change
• 2. It has energy if it is causing change or can
cause change
• 3. kinetic and potential
• 4. radiant and thermal
• 5. electrical (and chemical)
• 6. chemical
• 7. potential
• 8. chemical
• 9. radiant
Classwork / Homework
Answers
Worksheets – C13, energy (pg. 25)
• 10. nuclear
• 11. thermal
• 12. kinetic
• 13. kinetic
• 14. transferring
• 15. greater
• 16. less
• 17. potential energy
• 18. more
• 19. more
Classwork / Homework
Answers
Textbook – Chapter Review – C13, energy (pg.
400)
• 10. C - potential
• 11. D - radiant
• 12. D – chemical to kinetic (food to motion)
• 14. A - chemical
• 20. answers will vary
• 21. answers will vary
Classwork / Homework
Answers
Textbook – Chapter Review – C13, energy (pg.
402)
• 2. B - 2002
• 4. D - 2028
• 6. C – 7.6 (38.2 * 20% = 7.6)
• 8. B – potential to kinetic