Why can a tiny kid lift a giant grown-up on a seesaw?
Open for the projector Present it step by step
Classroom mode
A question for the whole room
One story to open. A room full of ideas to test.
Ready in three steps
- Open the story.Read and try the first pages together.
- Pause for a prediction.At the story’s question, read its choices aloud. Invite a vote and ask, “What makes you think that?”
- Run it. Watch. Wonder.Choose the class’s prediction, run the experiment, and compare what happened with your guesses.
Different guesses are welcome. The experiment gives everyone something to rethink.
Something to put on paper
A one-page prediction and observation sheet. No answers included.
After the experiment: discussion notes
Talk about what happened
- Predict before testing: with the pivot in the middle, who sinks — the heavy rider or the light one? Then explain why distance changes the answer.
- Two things change at once when you slide the pivot toward the heavy rider. Name both, and predict how each one helps the lighter rider.
- The kid lifts the giant but moves a long way to do it. Predict whether the work (force times distance) is really the same on both sides, then check.
Where it shows up in real life
- A playground seesaw with a heavier friend or sibling
- A door that swings easily when you push at the handle but barely budges near the hinges
- A crowbar or wheelbarrow that turns a small push into a big lift
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