15
Lesson 15 of 84 · Forces
ExperimentPulleys Pull Things Up
What You'll Learn
Things roll, slide, bounce, or spin depending on their shape and the forces acting on them.
Key Words
- simple machine
- lever
- ramp
Materials Needed
- marbles
- paper clips
- rubber bands
- blocks
- spring scale
- stopwatch
Safety First
- Handle glass items carefully to avoid breakage.
Steps
Step 1 — Read
Talk about what you already know about Forces.
Step 2 — Do
Build a simple lever with a ruler and pencil. Try lifting objects on one end by pushing the other.
Step 3 — Observe
Compare what happened to what you predicted.
Step 4 — Record
Tell the class one thing you learned today.
Check Your Understanding
Question 1
1 of 3Does a seesaw use a lever?