84
Lesson 84 of 84 · Forces
ExperimentSmooth and Rough Surfaces (Part 3)
What You'll Learn
When two surfaces rub together, friction produces heat. Rub your hands together to feel it!
Key Words
- push
- pull
Materials Needed
- toy cars
- ramps
- string
- weights
- tape
- ruler
Safety First
- Adult supervision recommended.
- Do not taste any materials.
Steps
Step 1 — Read
Read and learn: When two surfaces rub together, friction produces heat. Rub your hands together to feel it!
Step 2 — Do
Measure using your ruler or measuring cup.
Step 3 — Observe
Draw a picture of what you observe.
Step 4 — Record
Share your results with a partner.
Check Your Understanding
Question 1
1 of 3What happens when opposite poles of magnets meet?