Newton’s second law in one card: find force, mass or acceleration, and see the object’s Earth weight alongside.
Force Calculator
Result
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Weight of the mass on Earth (m × 9.81)
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How it works: F = m × a — force in newtons equals mass in kilograms times acceleration in m/s². One newton is roughly the force of holding a small apple against gravity. Weight is just this law with Earth’s gravity: weight = m × 9.81 N. Mass never changes with location; weight does — the same 10 kg mass weighs only about 16 N on the Moon.
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Estimates only — results depend on the values you enter and the standard formulas shown above.