MCQ Detailed View

The correct answer is Mass. In physics, mass is defined as the measure of the amount of matter contained in an object. It represents the total number of particles, such as atoms and molecules, that make up the object. Mass is considered a fundamental property of matter and does not change regardless of the object’s location in the universe.

Mass is usually measured in kilograms (kg) in the International System of Units (SI). Unlike weight, which depends on the gravitational pull acting on an object, mass remains constant everywhere. For example, a person with a mass of 60 kg on Earth will still have a mass of 60 kg on the Moon or in space, even though their weight will be different because the gravitational pull varies.

Weight is the force exerted on a mass due to gravity. It is calculated as:

$$Weight=Mass\times GravitationalAcceleration(g)$$

On Earth, g≈9.8 m/s2g \approx 9.8 \, m/s^2g≈9.8m/s2. This means weight changes with location, but mass does not.

Mass also determines an object’s inertia, which is its resistance to a change in motion. Objects with larger mass require greater force to accelerate. This principle is central to Newton’s First Law of Motion and is an important concept in mechanics.

To summarize:

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  Mass = quantity of matter, constant everywhere.

  
  


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  Weight = force due to gravity on that mass, varies with location.

  
  


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  Force = interaction that changes motion, not the same as mass.

  
  

🔑 Key Facts:

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  Mass is the amount of matter in an object.

  
  


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  SI unit of mass = kilogram (kg).

  
  


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  Mass is constant; weight changes with gravity.

  
  


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  Weight = Mass × g.

  
  


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  Mass determines inertia and resistance to motion.

  
  

👉 Final Answer: The quantity of matter in an object is called Mass.