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Sreeshan · 2024-01-16T10:17:57.067Z

What is mass? • Mass is a fundamental property of matter that measures the amount of matter in an object. It determines an object's resistance to changes in motion (inertia) and its gravitational pull on other objects. The SI unit of mass is the kilogram (kg). We often misunderstand what mass and weight are... What is weight • Weight is the force exerted on an object due to gravity. It's not the same as mass, which is the intrinsic amount of matter in an object. The relationship between weight (W) and mass (m) is given by the equation: W = mg Weightlessness • Weightlessness describes the sensation of having no weight. It occurs when an object experiences free fall, accelerating solely under gravity's influence. While "zero gravity" is often used interchangeably, it's technically inaccurate because some gravity is still present. Why do we feel weightless? • No contact forces: In everyday life, we feel our "weight" because the ground (or another surface) pushes up against us, balancing the downward force of gravity. During free fall, this upward force is absent, making us feel weightless. • Equal acceleration: Even in free fall, gravity still pulls us down. However, if the entire spacecraft or environment around us also falls at the same acceleration due to gravity, we don't perceive any relative difference in acceleration between ourselves and our surroundings. This lack of "push" or "pull" contributes to the weightless sensation.

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Sreeshan

Jan 16, 2024

Edited: Jan 16, 2024

Mass and weight

in Sreeshan

What is mass?

Mass is a fundamental property of matter that measures the amount of matter in an object. It determines an object's resistance to changes in motion (inertia) and its gravitational pull on other objects. The SI unit of mass is the kilogram (kg). We often misunderstand what mass and weight are...

What is weight

Weightlessness

Why do we feel weightless?

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Mass and weight