Dumbbell bar and car: what they have in common

1. Step 1. Dumbbell bar — is part of — Dumbbell. A steel rod that serves as a handle.
2. Step 2. Dumbbell — uses — Universal gravitation. Weight.
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 — Seat belt. It restrains the body during sudden braking.
5. Step 5. Seat belt — is part of — Car. Seat belts.

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