Physics
Identify the correct statement from the following :
- Mass is a force and is measured in Newton.
- The weight of a body is the same everywhere in the universe.
- Mass remains constant, but weight changes with gravity.
- Weight is measured using a physical balance.
Motion in One Dimension
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Answer
Mass remains constant, but weight changes with gravity.
Reason — Mass is the amount of matter in a body so it does not change regardless of location but weight is the force with which a body is attracted towards the Earth (or any other celestial body), and it depends on gravity and is given by :
So, weight changes when gravity (g) changes (e.g., on the Moon, where gravity is less, weight is less).
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Reason (R) : The magnitude of non-contact force between two bodies varies inversely as the square of distance of separation between them.
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