Torsion beam with small balls and fitness tracker: what they have in common

1. Step 1. Torsion beam with small balls — is part of — Torsion balance. Small balls on a rod.
2. Step 2. Torsion balance — is used in — Universal gravitation. The Cavendish experiment — weighing the Earth.
3. Step 3. Universal gravitation — is a kind of — Newton’s laws. Part of Newtonian mechanics.
4. Step 4. Newton’s laws — is used in — Accelerometer. The sensor measures the force of inertia.
5. Step 5. Accelerometer — is part of — Fitness tracker. A pedometer.

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