Last Updated: 24 March 2026Verified for JEE 2026
PhysicsJEE & NEET
Difference Between Mass and Weight
Mass and weight are commonly confused but are fundamentally different physical quantities. Mass is the amount of matter in an object, while weight is the gravitational force acting on that mass.
Mass vs Weight — Comparison Table
| Aspect | Mass | Weight |
|---|---|---|
| Definition | Amount of matter in object | Force of gravity on object |
| Type | Scalar | Vector (directed toward center of gravity) |
| SI Unit | Kilogram (kg) | Newton (N) |
| Formula | Constant | W = mg |
| Varies with location? | No | Yes (depends on g) |
| Zero gravity | Remains same | Becomes zero |
| Measured by | Beam balance | Spring balance |
Key Points to Remember
Mass is intrinsic; weight depends on gravitational acceleration
Weight on Moon is ~1/6th of weight on Earth
In space (zero-g), weight = 0 but mass remains unchanged
Mass is measured in kg; weight in Newton (1 kg weight ≈ 9.8 N on Earth)
Exam Relevance
This topic falls under Laws of Motion in Physics for both JEE and NEET. Questions on the difference between mass and weight appear frequently in competitive exams, both as direct MCQs and as part of numerical/assertion-reason problems.
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