A swimmer pushes water backwards and moves forwards: this law pairs equal and opposite forces.

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Your new ahaNewton's Third Law

Newton's Third Law: Principle that every force has an equal and opposite reaction. Source: Newton's laws of motion ↗

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06This upward force exerted by a fluid helps immersed objects float.RECALL
Buoyancy
Buoyancy is the upward force fluids exert on submerged objects, first explained by Archimedes.
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07Relative motion changes a wave's observed frequency in this effect, familiar from a passing siren.RECALL
Doppler Effect
The Doppler effect shifts a wave's pitch with relative motion and helps astronomers measure how fast stars move.
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08This inward force keeps an object moving along a curved path.RECALL
Centripetal Force
Centripetal force keeps a moving object on a curved path by constantly pulling it toward the center.
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