energy. what is energy? energy is the capacity to do work or to produce heat
TRANSCRIPT
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ENERGY
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What is energy?
Energy is the capacity to do work
or to produce heat.
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Forms of Energy
Energy comes in many forms, but they can beconveniently classified into three categories.
Radiant Energy
Kinetic Energy
Potential Energy
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What is radiant energy?
Radiant energy is energy given off by thesun that can travel through empty space.
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Examples of Radiant Energy
Visible light
X-rays
Radio waves
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What is kinetic energy (KE)?
Kinetic energy is energy in motion.
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Types of kinetic energy
Mechanical energyEXAMPLE: a moving car
Thermal (or heat) energyEXAMPLE: boiling a pot of water
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What is potential energy (PE)?
Potential energy is stored energy.
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Types of potential energy
Gravitational potential energyEXAMPLE:
Electrical energyEXAMPLE:
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Types of potential energy
Chemical energyEXAMPLE:
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Law of Conservation of Energy
The law of conservation of energy states that energy is
neither created nor destroyed. It can betransformed from one kind of energy into
another.
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Energy Transformation
Modern civilization is possiblebecause we have learned how tochange energy from one form toanother and use it to do work forus and to live more comfortably.
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SOURCES OF ENERGY
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Measuring Energy
Energy can be measured using:a.) Calorie (C) the energy stored in food
b.) calorie (cal) the amount of heat needed to raise the temperature of 1g of water x 1°C
c.) Joule (J) SI unit of energy (1 cal = 4.184 J)
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Practice Problems
Conversion between calories and joules ( 1 cal = 4.184 J)
1.If a container of water absorbs 25 calories of energy, how many joules of energy did the water absorb? (cal J)
(1 cal = 4.184 J)
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2.If a container of water absorbs 400 joules of energy, how many calories of heat did the water absorb? (J cal)
(1 cal = 4.184 J)
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3.Suppose you use 135 cal of energy to perform a task. How many joules have you used? (cal J)
(1 cal = 4.184 J)
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Practice Problems
c. 20 kilocalories joules
20,000 cal
d. 2.4 kilojoules calories
2,400 J
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DO NOW: Energy Concept Map
ENERGY
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Energy Transformations
Burning gas to drive a car
chemical thermal mechanical
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2.1 Review and ReinforcementCalorie and Joule Conversions
14. Convert 5.42 calories and joules. (1 cal = 4.184 J)
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15. Convert 726.030 calories to kilojoules. (1 cal = 4.184 J)
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16. Convert 60.5 J to calories. (1 cal = 4.184 J)