Small mirror and electric motor: what they have in common

1. Step 1. Small mirror — is part of — Torsion balance. It reflects the beam for reading the angle.
2. Step 2. Torsion balance — uses — Elasticity. The twisting of a fibre.
3. Step 3. Elasticity — is used in — Beam. Bending.
4. Step 4. Beam — is part of — Overhead crane. An overhead crane runs along a beam bridge under the workshop roof.
5. Step 5. Overhead crane — has part — Electric motor. Drives.

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