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Science - 3rd Grade
Standard 5 Objective 3
Classroom activities help students understand that heat may be produced when objects are rubbed together.
When objects are rubbed against one another, heat may be produced. When hands are rubbed together, the resulting heat will vary depending on how dry the hands are. The amount of moisture, perspiration, and/or oil on the skin will vary. You will observe that hands with recently applied lotion warm up less quickly.
1. Use a Science Process and Thinking Skills
4. Communicate Effectively Using Science Language and Reasoning
Pre-Assessment/Invitation to Learn
Review what it was like to be in a dark, cold cave. What was the best way to keep your hands warm?
The sand paper in your hand, and the hand holding it, will become warm. Have one or two students touch the heat sensor with their hands until it changes color. Time how long it took. Then have them try to rub the sandpaper with their hands for a minute, then try the heat sensor again. Now how long did it take? Was it quicker? Have all students rub with sandpaper, then put their hands on their faces. Can they feel the difference in temperature on their faces?
Language Arts -
Homework & Family Connections
Look around the house for machines that need lubrication. Ask parents when was the last time the car was taken in for an oil change. A visit to a flourmill would be an informative field trip. While there, ask the manager for information about the frequency that machinery needs oiling.
Check student's worksheet for understanding of objective.