Lesson 58 of 84 · Forces
Experiment⭐ 30 XP⚡ Spark LabBrakes Use Friction (Part 2)
Brakes Use Friction (Part 2).
🎯 Your mission
Run the experiment. Find out what really happens.
⚡ The twist
The opposite of what you expect is often what happens.
Mind = Blown
🎢 You feel weightless on a roller coaster because you and the seat are falling at the same speed.
Make a hypothesis first
Predict: what happens if you double the force?
What You'll Learn
Brakes on a bike use friction to slow down and stop. Press the brakes and friction does the work!
Key Words
Tap a word to see its definition.
Materials Needed
- weights
- tape
- ruler
Safety First
- Keep small objects away from young children.
- Work in a well-ventilated area when using vinegar or other strong-smelling substances.
Steps
Read the introduction. What is this lesson about?
Test a magnet on 10 objects around your house. Make a list of what sticks and what doesn't.
Look for something that changed. What is it?
Circle the correct answer on your worksheet.
Check Your Understanding
Question 1
1 of 3What kind of surface has the most friction?
Where you see this in real life
You use this every time you flip a light switch, ride a bike, or kick a ball.
Stretch Challenge
Try this in real life this week.
Time how long a small ball rolls down something, then change the slope and try again.
For the dinner table
“Show me something at home that uses this kind of energy.”
Next Smart Experiment
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