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Heat from Friction
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Heat from Friction
📚 Part 1: Multiple Choice & Quick Thinking
1. Which statement best explains why rubbing two surfaces makes them warm?
The surfaces create electricity when they touch.
Motion causes energy to change into heat because of friction.
Cold air pushes on the surfaces and warms them up.
2. During the class experiment you rubbed a block on a rough board for 2 minutes. Which action would most increase the heat produced?
Rub more gently with the same speed.
Rub faster and press harder.
Stop rubbing and wait quietly.
3. Check all examples where friction makes heat (select more than one):
Brakes on a bike when you slow down
Rubbing hands together to warm up
Putting ice in a cooler
Sliding wood to start a campfire
4. True or false: Friction always produces heat when two surfaces move against each other.
True
False
✏️ Part 2: Short Answers & Experiment Record
5. Before you started, write a short hypothesis: I think rubbing the block will make it feel _________ because ________________________.
6. Record temperature (if you used a thermometer). Write the temperature in °C:
Before rubbing: ____ °C
After rubbing: ____ °C
Time rubbing: ____ seconds (or ____ minutes)
7. Describe what you observed when you rubbed the block. Mention feel, sight or sound (one or two sentences):
8. Draw a quick sketch of your experiment setup. Label the block, rough surface and where you felt heat.
9. Explain in one or two sentences how energy moved during your experiment. Use the words motion, friction and heat.
10. Extension: Name one real-world place engineers might want to reduce friction and one place they might want to increase friction. Give one short reason for each.
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