Weight vs. Mass: Explaining the Difference

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SUMMARY

The discussion clarifies the distinction between weight and mass, emphasizing that mass is a measure of the quantity of matter, constant across different gravitational fields, while weight is the gravitational force acting on that mass. Mass is measured in kilograms (kg), whereas weight is measured in Newtons (N). The relationship between the two is defined by the equation Weight = mass * g, where g represents the acceleration due to gravity. Common usage often conflates the two terms, but understanding their scientific definitions is crucial for accurate communication in physics.

PREREQUISITES
  • Understanding of basic physics concepts, including force and gravity.
  • Familiarity with units of measurement, specifically kilograms (kg) and Newtons (N).
  • Knowledge of the relationship between mass and weight.
  • Basic comprehension of gravitational effects on objects.
NEXT STEPS
  • Research the concept of gravitational acceleration (g) on different celestial bodies.
  • Explore the implications of mass and weight in real-world applications, such as engineering and space travel.
  • Learn about the unit kgf (kilopond) and its relevance in physics.
  • Study the effects of varying gravitational forces on weight in different environments.
USEFUL FOR

Students studying physics, educators teaching science concepts, and anyone interested in understanding the fundamental differences between weight and mass in both scientific and everyday contexts.

koiuuuuuuuuuuu
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Homework Statement
Explain the difference
Relevant Equations
Classwork
In class we do Science and I have faced with the problem between Weight and mass.
Tutor told us that the weight is the force that causes everything to move.
Mass is the kg .Why then, people ask other people what weight are you?
Explain please.
Thanks
 
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koiuuuuuuuuuuu said:
Why then, people ask other people what weight are you?
Because there is a difference between common parlance and scientific accuracy.
 
from the Internet:
Mass measures the quantity of matter regardless of both its location in the universe and the gravitational force applied to it. An object's mass is constant in all circumstances; contrast this with its weight, a force that depends on gravity.

Your mass on the Earth and the moon are identical. Your weight on the moon is about one-sixth of your weight on the earth.
 
koiuuuuuuuuuuu said:
Tutor told us that the weight is the force that causes everything to move.
Weight is the gravitational force acting on the mass. (Which may or may not start moving.)
koiuuuuuuuuuuu said:
Mass is the kg .
Mass is measured in kg, while weight is measured in Newtons.
koiuuuuuuuuuuu said:
Why then, people ask other people what weight are you?
In everyday language, folks use weight and mass interchangeably. Since you're taking physics, you now know better!

But realize that weight and mass are proportional, so in everyday use it's all good: Weight = mass*g.
 
Also note the existence of the unit kgf (kilopond or kilogram-force), which is the weight of 1 kg in standard gravity.
 

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