Everyday Life & Technology
How does a seesaw work?
Puschel finds that a little move on the board changes a lot.
The short answer
A seesaw turns around its support. Each side's turning effect depends on weight and distance. A lighter weight farther out can therefore balance a heavier one closer in.
An imagined Wusel scene
Puschel and Flauschi investigate
A short board rests on a low support on the table. Puschel places a block on each side. Puschel“A seesaw for blocks!”
Flauschi“Exactly. Our paws stay away from the support.” They look instead of sitting on the little board.
Puschel carefully moves one block nearer the middle. The board tilts. Puschel“The block has not become lighter. Something still changed.”
Flauschi“Its distance from the middle changed. Further out, the same weight has more turning effect.”
They move the blocks back to equal distances. Puschel“My block seesaw needs space for thinking, not for sitting on.”
Little Wusel quiz
What affects a seesaw besides weight?
Choose one answer: a), b).
- a)Distance from the pivot.
- b)The distance between the blocks alone, without considering the pivot.
Show answer
Correct answer: a): Distance from the pivot. Distance from the pivot also affects turning.
Where does the same block have more turning effect?
Choose one answer: a), b).
- a)Nearer the middle.
- b)Further from the middle.
Show answer
Correct answer: b): Further from the middle. On this model it has more turning effect further out.
Word help
- axis
- An imaginary line around which something turns; in machines it may also be a physical part.
Explore in more detail
Here you will find longer explanations and further details. You can explore them together.
Understand step by step
How it works – simply explained
A pivot supports the middle
A seesaw rotates around its support. A person’s weight acts downwards on their side.
Distance changes the turning effect
The same force turns more strongly when applied further from the pivot. This distance is the lever arm. Weight alone does not explain motion.
Balance needs matching effects
A lighter weight further out can balance a heavier one nearer the centre. Real seesaws also involve design and safety; the model shows only the principle.
Why position matters on a seesaw
Imagine equal toy weights at equal distances from the middle: they can balance. Moving one closer reduces its turning effect, so the other may move its side down. Real seesaws have their own weight; the model omits such details to show lever arms. This is not an invitation to change position on a moving seesaw.
The key points again
Discovery 1
A seesaw is a lever: a rigid beam that can turn around an axis. In this model, the pivot is in the middle.
Source: [1]
Discovery 2
Weight is not the only thing that matters: distance from the pivot matters too. An equal-weight block further out has more turning effect than one near the middle.
Source: [1]
Discovery 3
On a symmetrical horizontal model, equal-weight blocks at equal distances can balance the sides. The board itself and other weights can affect balance.
Source: [1]