68
Lesson 68 of 84 · Simple Machines
ExperimentHow Fast Can It Go? (Part 3)
What You'll Learn
When you roll a ball on carpet, it stops faster than on a smooth floor. That is friction!
Key Words
- roll
- slide
- stop
Materials Needed
- rubber bands
- blocks
- spring scale
- stopwatch
Safety First
- Handle glass items carefully to avoid breakage.
- Do not mix unknown chemicals together.
Steps
Step 1 — Read
Can you name the things in the picture?
Step 2 — Do
Roll a ball down a ramp. Try making the ramp steeper. What happens?
Step 3 — Observe
Use your eyes, ears, and hands to explore. What do you notice?
Step 4 — Record
Color a picture to show what happened.
Check Your Understanding
Question 1
1 of 3Do heavy things or light things fall faster?