Use the information on page 132 to
answer questions 1 and 2 on the
worksheet.
Please do not write anything on #3 yet.
Here’s how to write an energy conversion for the book examples
• Skate boarding on half-pipe
Potential
Kinetic + Thermal
• Wound-up rubber band toy airplane
Potential
Kinetic + Thermal
• Eating Food
Chemical
Kinetic + Thermal
• Photosynthesis
Light
Chemical + Thermal
Copy the following energy conversion exactly
onto #3 on your paper
• Hair Dryer
Electrical
Kinetic + Thermal + Sound
Other examples are shown at the bottom of page 135.
Here’s one of my energy conversions for an example
Now create three energy conversions of
your own and write them on #4
Read page 139 and answer
questions 5, 6 and 7.
6. If you add together all the
individual energy amounts after
a conversion, you will end up
with the same total amount of
energy as you started with or
the original amount of potential
energy.
7. In a closed system, the amount of
energy before a conversion is the
same as the amount of energy after
the conversion. This is because of the
law of conservation of energy which
states that energy cannot be created
or destroyed, but simply changes from
one form to another.
Our hair dryer is the closed system. Let’s apply the Law of
Conservation of energy.
Hair Dryer
Electrical
Kinetic + Thermal + Sound
100 j
=
30 j + 40 j + 30 j
Make number 3 on your worksheet look identical
to the hair dryer example above.
TV
Electrical
500 j
Light + Sound + Kinetic + Thermal
= 200 j + 200 j + 50 j + 50 j