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Chapter 2 – Section 2 What’s the Difference Between Mass and Weight?

Chapter 2 – Section 2 What’s the Difference Between Mass and Weight?. Universal Law of Gravitation. All objects in the universe attract each other by the force of gravity. What does gravity depend upon?. Gravity varies depending on two factors:. 1) the mass of the object.

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Chapter 2 – Section 2 What’s the Difference Between Mass and Weight?

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  1. Chapter 2 – Section 2What’s the Difference Between Mass and Weight?

  2. Universal Law of Gravitation All objects in the universe attract each other by the force of gravity

  3. What does gravity depend upon? Gravity varies depending on two factors: 1) the mass of the object 2) the distance from the center of that object to the center of another object

  4. Universal Law of Gravitation • On Earth, the force of gravity accelerates objects by a rate of = 9.8 m/s2 ( m/s/s ) • This means that for every second (/s) that an object falls its speed increases by 9.8 m/s

  5. Universal Law of Gravitation • The acceleration due to gravity may be affected by the air resistance of the falling object. • (We’ll get into this more in our later units…)

  6. Objects that have a large surface area and a small mass will fall much slower than objects with a small surface area and large masses (We’ll get into this more in our later units…) Universal Law of Gravitation

  7. How Does Gravity Affect Mass? • Weight– the measure of the FORCE of attraction between object due to the pull of gravity. • An object’s mass will remain the same no matter where it is, unless matter is added to it or taken away. • An object’s weight will vary according to where it is in the universe and what objects are pulling on it by their gravity.

  8. Formula for Determining Weight Weight = Mass x Gravity • Mass is measured in grams or kilograms • Gravity is measured in m/s2 • So when we multiply them together, we get: g x m/s2 or kg x m/s2 only this one is a “Newton”

  9. Formula for Determining Weight Force of gravity = 9.8 m/s/s (m/s2) Unit of weight = Newton (N) ONLY when your original unit of mass is a kg because a Newton is a kg x m/s2 • This means that a Newton (N) is the same as a “kilogram meter per second squared” (kg x m/s2) • Unit of weight when your original unit of mass is grams is a “gram meter per second squared” (g x m/s2) • Unit of weight when your original unit of mass is milligrams is “milligram meter per second squared” (mg x m/s2 )

  10. Weight Mass Gravity Formula for Weight The same trick that we used for the density formula works for weight too! Think of a mnemonic device that helps you to remember the correct way to fill in this triangle trick!

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