May we remember this browser? It lets us tell a returning reader from a new one, which is the only way we can see whether anything we change actually helps. Say no and the site is exactly the same — we still count how many people opened this page, without keeping anything on your device. What we measure
Two or three questions, then the course we would build — before you make an account.
Two real lesson blocks. Push them.
Gravity down the slope beats friction, so the block accelerates at a constant 1.40 m/s². That's why speed climbs in a straight line while distance curves upward — distance is the area under the speed graph. Mass never appears in either sum.
Friction on a slope. Change the angle or µ while it's moving — the block keeps whatever speed it already had.
Start with nothing in the box.
A Python loop, traced line by line, with the variables changing beside it.