01
Foundation · 7 min
Balance the forces
Predict acceleration, create balance, and hit a target net force.
Explore lessonForces and energy · Ages 9–12
Predict what moves next.
Change forces, motion, light, and energy in responsive models that make cause and effect visible.
Learning path
Start with one good question.
Can you take control of two opposing forces?
02
Foundation · 7 min
Speed and motion
Read a journey and connect distance, time, and changing speed.
Coming next03
Challenge · 8 min
Light on the move
Position mirrors to guide a beam through a series of targets.
Coming nextLearn by doing
Try it before we explain it.
This local prototype does not save progress. Retry as often as you like— mistakes are part of the lesson.
Horizontal force modelLIVE
←3 N
CRATE
7 N→
Right 7 N − Left 3 NNet force 4 N rightWould accelerate right
This model shows horizontal forces. The vertical forces are treated as balanced.
Predict before calculating
Which way would the crate accelerate?
Two people push the same crate in opposite directions. Commit to a prediction.
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