Force is measured in newtons (SI), pound-force (lbf), kilogram-force (kgf/kilopond), and dynes. Force = mass × acceleration (Newton's second law). 1 newton is the force that accelerates 1 kg at 1 m/s².
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Pro Tip
Body weight in newtons: multiply your mass in kg by 9.81. A 70 kg person weighs 70 × 9.81 = 686.7 N. In pound-force: 686.7 / 4.448 ≈ 154 lbf.
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Did You Know?
The Saturn V rocket (which launched Apollo astronauts to the Moon) produced 33,360 kN (7.5 million lbf) of thrust at launch — enough to lift 130 elephants off the ground simultaneously.
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