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Science - 3rd Grade
Standard 5 Objective 2
Classroom activities help students understand that heat energy can be produced by mechanical and electrical machines.
Heat energy can be produced by mechanical and electrical machines and can sometimes produce light. Mechanical machines are those which do not use electricity, such as machines that use fuel (cars, lawnmowers), human strength (bikes, skateboards), or flowing water (water turbine). Classroom examples of mechanical machines include using scissors, a stapler, or a pencil sharpener.
Electrical machines include those which use electrical power and would have a plug or use batteries. Classroom examples include an overhead projector, electric pencil sharpener, computer, heat lamp, TV, or VCR.
1. Use a Science Process and Thinking Skills
3. Understand Science Concepts and Principles
Pre-Assessment/Invitation to Learn
Ask students for some examples of heat sources - things that produce heat. Write them on the board. If machines are not mentioned, talk about some machines that also give off heat, even if they are used for something else. Has anyone ever felt the back of a computer? Sometimes that is warm. Light bulbs can get so hot that you could burn yourself if you touched one while it was still on.
Today, we're going to hear a story about a Little Orange Rooster (pdf). While listening to the story, think about all the machines that he and his friends use, and think about if those machines would get warm or not.
Homework & Family Connections
Encourage students to show their family how to make Machine toast (see Assessment Suggestion #2). Each family member must draw a different type of machine, and label it as mechanical or electrical.
a. Teacher will pour 1/2 cup of milk into four small bowls.
b. Put two drops of food coloring in each bowl (one color per bowl).
c. Have students use a clean paintbrush and paint a picture of their favorite machine on one side of the bread. The picture should only be outlined, so the bread won't get soggy. Then they will paint an "M" for "mechanical", or an "E" for "electrical", to show what type of machine it is.
d. Toast the bread in a toaster.
e. Spread with butter and jam if desired.