PET and mechanical clock: what they have in common

1. Step 1. PET — includes — Polyester. Polyester fibre is PET.
2. Step 2. Polyester — is material for — Seat belt. The webbing is polyester.
3. Step 3. Seat belt — uses — Newton’s laws. It restrains the body during sudden braking.
4. Step 4. Newton’s laws — is used in — Pendulum. The swing is described by Newtonian mechanics.
5. Step 5. Pendulum — is part of — Pendulum clock. The pendulum sets the period.
6. Step 6. Pendulum clock — evolved from — Mechanical clock. Huygens added a pendulum to the mechanical clock.

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