27
Lesson 27 of 84 · Forces
ExperimentSprings and Stretches
What You'll Learn
A top spins because you give it a twist. It slows down because of friction with the air and surface.
Key Words
- balance
- weight
- strong
Materials Needed
- stopwatch
- pencils
- toy cars
- ramps
- string
- weights
Safety First
- Wash hands after handling materials.
Steps
Step 1 — Read
Look at the new words. Can you say each one?
Step 2 — Do
Make a ramp from a book. Roll a marble down from different heights. Measure how far it rolls.
Step 3 — Observe
Use your senses to describe what you notice.
Step 4 — Record
Write 1-2 sentences about what happened.
Check Your Understanding
Question 1
1 of 3What force keeps you on the ground?