Newton's three laws — final

Series final

Newton's three laws — final

8.01SC · Newton's Laws of Motion · Age 8

All three sittings. Leftover motion, stubbornness, and pairs. No jokes. Say it like you mean it.

This series must show: inertia / first law · the 'backward force' misconception · second law / net force changes motion · mass as stubbornness · third law / action-reaction pairs

Diagnostic

1. You sit still in a wagon. A friend yanks it forward. For a moment you feel like you are falling back. What is true?

AThe wagon shoved you backward with a real forceBYou kept leftover stillness. The wagon left.CGravity briefly pointed backwardDWagons make a backward wind

2. A soccer ball is already rolling on smooth dirt. Nobody is touching it. What does it try to do?

AStop at once, because motion uses itself upBKeep rolling until something real slows itCSpeed up because rolling things like speedDTurn into a cube

3. The same finger-flick hits a toy car and a crate of books. The car races. The crate nods. Why?

AThe crate did not get a real pushBThe crate is more stubborn about changing its leftover stillness — more massCHeavy things cannot moveDThe car is luckier

4. You jump off a skateboard and the board rolls backward. Who pushed you forward?

ANobody. You just decided to goBThe board. You pushed it, so it pushed you — a pairCThe air in front of youDGravity, sideways

5. On slick ice your foot cannot push the ground backward much. You slip. That is because…

AIce has no massBWalking needs the ground to push you forward — the other half of the pairCYour legs forgot the first lawDIce makes a backward force

Show your work

6. 6. Draw or say: a wagon yank, a flick on a toy and a crate, and two children pushing on ice. Under each, write which law you just used.

   Hint: Stillness, stubbornness, pair.

In your own words

Tell the three laws in kid words, in order, without using the word 'Newton.'

A situation you have not seen