계산 방법 무게 (W = mg): 질량 vs 힘

계산 무게 with W = mg. 질량 vs 무게, g = 9.8 vs 10, 일ed examples, and a free 무게 calculator.

What 무게 Asks

무게 is the gravitational 힘 on an object. 질량 tells you how much matter you have; 무게 tells you how hard gravity pulls on that matter. Same backpack on Earth and the Moon has the same 질량 but different 무게.

Near Earth’s surface the 공식 is W = m g. 질량 m in kilograms times gravitational field strength g (usually 9.8 m/s² or N/kg) gives 무게 in newtons (N).

If you already have m and g (or W and one unknown), open the free 무게 calculator first, then return here for 질량-vs-무게 traps and links to normal 힘 and buoyancy.

The 공식s

  • W = m g — 무게 from 질량 and g.
  • m = W / g — rearrange for 질량.
  • g = W / m — rearrange for field strength.

    • Use the g value your 일sheet or exam gives (9.8, 9.81, or 10). Do not mix two different g values in one problem.

    질량 대 무게

  • 질량 (kg) is the same everywhere in ordinary classroom problems.
  • 무게 (N) changes if g changes — Moon, other planets, or free fall contexts.
  • Never put kilograms into a 힘 equation that expects newtons without converting with g.

    • On a flat floor with no other vertical 힘s, normal 힘 equals 무게: N = mg. See the normal 힘 calculator and the

    normal 힘 guide.

    무게, 힘, and 부력

    무게 is a 힘, so it fits Newton’s second law when gravity is the net 힘: F = ma with a = g. Use the 힘 calculator for F = ma in general.

    Float or sink 비교s object 무게 W = mg to buoyant 힘 Fb = ρVg. See buoyancy and

    Archimedes’ guide.

    단위

  • m → kg.
  • g → m/s² or N/kg (same numeric value).
  • W → newtons (N). 1 N = 1 kg·m/s².
  • If 질량 is given in grams, convert to kilograms first (÷ 1000).

    • 풀이 예제

    예제 1: 5.0 kg on Earth

    g = 9.8 m/s². W = m g = (5.0)(9.8) = 49 N downward.

    예제 2: find 질량 from 무게

    W = 98 N, g = 9.8. m = W/g = 98/9.8 = 10 kg.

    예제 3: g = 10 estimate

    m = 2.5 kg, g = 10. W = 25 N — common when the paper allows g = 10.

    예제 4: same 질량, different g

    m = 60 kg. Earth (g = 9.8): W = 588 N. Moon-like g = 1.6: W = 96 N — 질량 unchanged.

    흔한 실수

  • Treating kilograms as newtons inside 힘 or buoyancy problems.
  • Putting 무게 (N) into the 질량 slot of F = ma or PE = mgh.
  • Forgetting that 무게 is a downward 힘, not a scalar 질량 label.
  • Using Earth g on another planet or in orbit without adjusting.

    • 확인 It on the 계산기

    무게 calculator — W = mg.

    힘 calculator.

    Normal 힘 calculator.

    부력 힘 calculator.

    학습 W = mg and confirm every home일 number on the calculator.

    문서

    • 탄성 위치 에너지 공식 (U = ½kx²): 계산기 & 예제
    • 계산 방법 전기 전력 (P = VI, I²R, V²/R)
    • 계산 방법 파동 속도 (v = fλ): 주파수 × 파장
    • 계산 방법 밀도 (ρ = m/V): 질량 ÷ Volume
    • 계산 방법 가속도 (a = (v − u)/t)
    • 계산 방법 힘 (F = ma): Newton’s Second Law

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