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How Hot Is It?

 
Some machines produce a lot of heat when they are used, and some produce such a small amount of heat that it is difficult to notice that heat is produced. Look at the pictures below to see how much heat is produced when these machines are being used. Notice the temperature given below each photograph. The difference in temperatures shown on the right shows how much heat is produced when the machine is used.
 
Toaster

Off

On

Difference
77 F
212 F

212

- 77

135

Lamp

Off

On

Difference
77 F
 89 F

  89

-77

12

 
Bicycle Pump 
Standing

Being pumped

Difference
 77 F
 95 F

  95

- 77

18

 

Look closely at the graph of this data.

 

Analysis:

  1. Did each item start at the same temperature?
  2. Which object had the greatest change in temperature?
  3. Which object had the smallest change in temperature?
  4. Did any of the results surprise you?
 
Try It:
Work with an adult to predict, measure, and graph temperature changes.
 
Materials:
  • Thermometer
  • Lab worksheet or science journal
  • A mechanical or electrical machine
 
Procedure:
  1. Record the name of the machine on your paper.
  2. Decide if the machine uses mechanical or electrical energy.
  3. With adult help, measure and record the temperature of the machine before turning it on. This is the "Off" temperature.
  4. Set the thermometer near the machine and turn it on.
    1. Wait five minutes. (CAUTION - It may get hot enough to burn. Have an adult help you!)
  5. Record the temperature after five minutes. This is the "On" temperature.
  6. Subtract the "Off" temperature from the "On" temperature.
  7. Graph the temperature difference on your paper.
 
Try other machines.
 
 
EarthMoonImage
LivingOrNotLivingImage
ForceMotionImage
GravityImage
HeatAndEnergyImage

Download the plug-ins: Get Adobe Acrobat Reader, and Get Quicktime Player. (The QuickTime plug-in is needed to play sounds and movies correctly.)

Want to share photos of you or your friends doing this activity? Send it in an e-mail with the following information:

  1. The title of the activity
  2. The URL (Internet address)
  3. Your name.

Remember that no pictures can be used that show student faces or student names on it. 

Teachers should view the Teacher Site Map to relate Sci-ber text and the USOE 3rd grade science core.


Updated October 24, 2008 by: Glen Westbroek

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