Download Physical Science Packet 19: Energy Due: May 28th _____/ 25

Content Objective: Show how the interaction of energy and matter obeys the law of
conservation of energy.
Physical Science
Packet 19: Energy
Due: May 28th _____/ 25
Name_________________________________________ Group__________________
Kinetic Energy vs. Potential Energy
Kinetic energy is the energy of motion. An object that has motion - whether it is vertical or
horizontal motion - has kinetic energy. The amount of kinetic energy that an object has depends
upon two variables: the mass (m) of the object and the speed (v) of the object. The following
equation is used to represent the kinetic energy (KE) of an object.
KE = ½ • m • v2
Potential energy is the stored energy of position possessed by an object.An object can store
energy as the result of its position. For example, the heavy ball of a demolition machine is
storing energy when it is held at an elevated position. This stored energy of position is referred
to as potential energy. PE = mass • 9.8m/s2 • height
The Law of Conservation of Energy
When you turn on an electric heater, electrical energy is converted to heat energy. If you
measure the amount of electricity supplied to the heater and the amount of heat produced by
the heater, you will find the amounts are equal. In other words, energy is conserved in the
heater. It may take various forms, such as electrical energy, heat, magnetism, or kinetic energy
(the energy of an object due to its motion), but the relationship is always the same: The amount
of energy used to initiate a change is the same as the amount of energy detected at the end of
the change. In other words, energy cannot be created or destroyed in a physical or chemical
change.
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Content Objective: Show how the interaction of energy and matter obeys the law of
conservation of energy.
ENERGY TOWN: Go to: http://www.energyville.com/energyville/\
1. Enter a name for your city (be appropriate).
2. Click on guided play. Read Instructions.
3. Fill in the needs of the following parts of the city.
Factories
Residential Homes
Vehicles
Commercial Buildings
Mass Transit
Airplanes
Trucking
Office Buildings
4. Drag and drop different energy sources to power your city. List the power
sources and describe the cost, environmental impact and security.
Energy Source
$
•
•
•
•
•
•
•
•
Total
approximate
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Content Objective: Show how the interaction of energy and matter obeys the law of
conservation of energy.
Investigating Energy and Falling motion
Elastic Potential Energy (EPE) Elastic potential energy is the energy stored in elastic
materials as the result of their stretching or compressing. The amount of elastic
potential energy stored in such a device is related to the amount of stretch of the device.
Materials:
Meter stick
3 different balls
Procedure:
1. Have one member of the group hold the meter stick upright with the zero mark on
the floor.
2. Have a second member of the group drop the ball from the top of the meter stick
(100 cm) in such a way that it does not touch the meter stick on the way down.
3. Have a third member of the group record the height of each bounce on data table 1.
4. Repeat steps 1-3 with the other two balls recording the information on data table 1.
5. On graph 1 using a different color for each ball show the height of each drop.
Data Table 1
Type of
First
ball
bounce
Graph 1
80 cm
70 cm
60cm
50 cm
40 cm
30 cm
20 cm
10 cm
1
Key
Second
bounce
2
Third
Bounce
3
Fourth
Bounce
4
Fifth
Bounce
5
Sixth
Bounce
6
Analysis and Conclusions:
Which Ball retained the greatest percentage of its kinetic energy on each bounce?
What happened to the energy in the ball on each bounce?
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Content Objective: Show how the interaction of energy and matter obeys the law of
conservation of energy.
Movie Notes: Extreme Energy
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Conservation of Energy Comic
Vocab: Define the following terms
Law of Conservation of Energy:
Energy:
1. The difference between _________________ energy and _____________
energy is ___________________________________________________.
2. ___________________ energy can be turned into __________________ energy
by__________________________________________________.
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