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Building up Friction

A series of activities to build up intuition on the mathematics of friction.

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Uniformly Unstable

Invent shapes with different numbers of stable and unstable equilibrium points

Hold Still Please

Stage: 5 Challenge Level: Challenge Level:1

Don't forget that the total vector force on a particle equals the vector sum of the forces from all other particles.

For an unconstrained particle not to move, the total force on the particle must equal the zero vector.