Pivot joint and fitness tracker: what they have in common

1. Step 1. Pivot joint — is part of — Compasses. The pivot of the opening.
2. Step 2. Compasses — uses — Lever. Two legs on a hinge.
3. Step 3. Lever — is used in — Steering wheel. A handlebar is a lever.
4. Step 4. Steering wheel — has part — Airbag. An airbag hides in the steering wheel and inflates instantly in a crash.
5. Step 5. Airbag — has part — Accelerometer. The crash sensor is an accelerometer.
6. Step 6. Accelerometer — is part of — Fitness tracker. A pedometer.

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