Energy

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Energy Heat Review
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B
Does not emit as much pollution, does not burn
fossil fuels
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Heat, electrical
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Kinetic or mechanical
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Pull the arrow back a little more before
releasing it, use a lighter arrow
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Student B has a greater height.
As they enter they water they slow down, so KE
decreases.
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Generates electricity without pollution.
Takes up a lot of space, may affect organisms
that live in the water, costs a lot of money to
build
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Once they are used up, they are no longer
available because they take millions of years to
form.
Releases pollutants into the air, releases carbon
dioxide into the air which leads to global
warming.
Using solar energy, wind energy, hydroelectricity
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Burning fossil fuels when driving cars or
generating heat in homes.
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They do not release pollutants in to the air or
carbon dioxide.
They take up a lot of space, they can affect
birds, if there is no wind, electricity cannot be
generated.
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There are more cars being used. There are more
homes being built.
Install more wind turbines, install solar cells
on buildings and homes.
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liquid
gas
Oil, natural gas
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sun
Driving car, heating home, using barbeque
Solar energy, biomass
chemical
mechanical
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yes
no
no
no
yes
yes
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Tightly packed together, side by side, in rows
They should slowly start to move away from each
other.
They should start to move a little faster,
sliding past each other.
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Evaporation or boiling
Melting or condensation
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condensation
melting
Evaporation
Its less dense than the water
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It is less dense than the water
It dissolved in the water.
Use a strainer, or filter paper to separate the
mixture.
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solid
liquid
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The metal expanded when it was heated because the
molecules moved faster and farther apart.
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The ball is still made of the same material, and
remained the same shape.
The ball expanded and changed in size but not in
composition.
The ball is still made of the same type of metal.
Composition did not change.
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Cool it down by placing it in cold water.
As temperature increases, the speed of the
molecules also increases.
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Temperature
Surface area/size of the particles of sugar
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Use filter paper or a strainer to separate the
mixture.
Evaporate the water by heating it up.
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salt
sand
water
The substances are physically combined. They did
not change into a new substance.
The water evaporated.
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As temp increases the amount of solute than can
dissolve increases.
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36 g
As temp increases the solubility of the gas
solute decreases.
Stir it, or heat it up.
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100-70
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• 74. Energy appears in many forms. Which form of
  energy is lightening?
• Magnetic
• Mechanical
• sound
• Electrical

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• 75. When an electric current flows through a
  metal filament of a light bulb, the electrical
  energy is converted into
• heat energy, only
• heat and light energy
• light and motion energy

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• 76. A high diver steps off a diving platform that
  is 10m above the water. If no air resistance is
  present, during the fall there will be a decrease
  in the divers
• gravitational potential energy
• total mechanical energy
• kinetic energy
• momentum

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• 77. If both of these balls are traveling down a
  bowling lane at the SAME speed, which one would
  have more kinetic energy? Support your answer.

Ball A has a larger mass
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• 78. Which of the following is an example of
  kinetic energy?
• A car not moving
• Water falling off a dam
• A rock resting on a ledge
• A person sitting in a chair

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• 79. Which device produces mechanical energy?
• A battery
• A light bulb
• An electric motor
• A solar cooker

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• 80. A song is playing on the radio. Which best
  describes the change in the flow of energy?
• Electrical energy ? light energy
• Electrical energy ? sound energy
• Sound energy ? light energy
• Sound energy ?electrical energy

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• 81. At which two points on the pendulum, is the
  pendulum experiencing the greatest potential
  energy?

A and D (stops moving at these points)
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• 82. Which skier will have a greater potential
  energy?  Support your answer.

Skier 1 height is greater
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• 83. As a river flows through a turbine in a
  hydroelectric power plant, the potential energy
  of the water behind the dam changes to
• chemical energy
• nuclear energy
• mechanical energy
• radiant energy

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• 84. A bicycle rider ate breakfast before the
  ride. Which energy transformation occurred during
  the bike ride?
• Kinetic to chemical energy
• Chemical to kinetic energy
• Kinetic to nuclear energy
• Nuclear to kinetic energy

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• 85. Which of the following increases when a metal
  spring is stretched horizontally?
• Potential energy
• Kinetic energy
• Chemical energy
• Electrical energy

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• 86. A family is moving from Pennsylvania to
  Connecticut. As the moving van burns gasoline, it
  converts
• chemical energy into mechanical energy
• kinetic energy into potential energy
• thermal energy into electrical energy
• mechanical energy into kinetic energy

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• 87. What happens to the kinetic energy and
  gravitational potential energy of a ball during
  free fall?
• GPE and KE both increase.
• GPE and KE both decrease.
• GPE decreases and KE increases.
• GPE increases and KE decreases.

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• 88. Which energy source was developed through the
  invention of the atomic bomb?
• Nuclear
• Geothermal
• Solar
• Hydropower

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Hydrogen and oxygen
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