Chapter 13

Transcript Chapter 13

Chapter 13
Energy and
Power
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Section 13-1
Energy is the ability to do work
or cause a change.
Therefore, work is the transfer of
energy.
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Energy is measured in units called
A. Joules
B. Pounds
C. Meters
D. Horsepower
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2 Kinds of Energy
1. Kinetic Energy
2. Potential Energy
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Kinetic Energy
Energy that an object has
because of its motion.
depends on both its mass and
its velocity.
The more work you do, the
more energy you transfer.
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Which of the following has kinetic
energy?
A. A rock poised for
a fall
B. An archer’s bow
that is drawn back
C. A rolling bowling
ball
D. A car waiting at a
red light
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Potential Energy
Energy that is stored
and held in readiness.
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Potential Energy
Elastic Potential Energy –
The energy of stretched or
compressed objects.
Example: Bow or Rubber
band
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The ability to do work
A. Velocity
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B. Energy
C. Conversion
D. Friction
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Gravitational
Potential Energy
is energy that
depends on the
height of an
object.
The greater the
weight or the
greater the height
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A cart at the top of a hill is released and
rolls down the hill. Which of the
following describes the energy of the
cart just as it reaches the bottom of the
hill? A. The cart has no energy.
B. The cart has maximum kinetic
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energy.
C. The cart has maximum
gravitational
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D. The cart has equal gravitational
potential and kinetic energy.
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Different Forms of Energy
1. Mechanical Energy – Kinetic
or potential energy associated
with the motion or position of
an object.
2. Thermal Energy – The total
energy of a substance’s
particles due to their movement
or vibration.
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3. Chemical Energy – The
potential energy stored in
chemical compounds.
4. Electrical Energy – The energy
of moving electric charges.
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Electromagnetic Energy –
The energy of light and other
forms of radiation.
Nuclear Energy – The
potential energy stored in
the nucleus of an atom.
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Visible light is an example of
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D. Nuclear energy
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Energy stored in the core of an
atom is called
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B. Nuclear energy
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D. Chemical energy
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The total energy of the particles in
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D. Electrical energy
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An example of something that
stores chemical energy is
A. Lightning
B. A microwave
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