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Mass vs. Weight

Mass vs. Weight. Definitions. Mass – Amount of stuff (matter) in an object Weight – Force exerted on an object because of a planet’s gravity Related, but not the same! Mass ≠ Weight!. How to Find Mass. Two types of mass! Gravitational Mass 2. Inertial Mass A Video. How to Find Weight.

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Mass vs. Weight

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  1. Mass vs. Weight

  2. Definitions Mass – Amount of stuff (matter) in an object Weight – Force exerted on an object because of a planet’s gravity Related, but not the same! Mass ≠ Weight!

  3. How to Find Mass Two types of mass! • Gravitational Mass 2. Inertial Mass A Video

  4. How to Find Weight • Weigh it! • Calculate it! But how? Like all forces, you can measure weight (force of gravity) with a spring scale!

  5. Discovering the Relationship Between Mass and Weight- OR –Why Pirates Have Pet Toucans and Not Pet Emus Arg?

  6. A Sample Graph(Thanks to Jacob and Teddy)

  7. The Importance of the Slope Tells you how much the weight (Fg) varies with mass: If you increase the mass by 1 kg, how much do you increase the weight by? Our calculated slopes

  8. Experimental Result g = 9.81 N/kg To calculate the weight, w, of an object of mass m: w = m∙g = 9.81 ∙ m

  9. Example Calculations • What’s the weight of a 1.2 kg toucan? w = mg = (1.2 kg)(9.81 N/kg) = 11.7 N 2. What’s the weight of a 97 kg emu? w = mg = (97 kg)(9.81 N/kg) = 952 N

  10. Weight Varies, Mass Does Not If you move to a different location, the amount of stuff in you doesn’t change, so your mass is always the same. BUT the force of gravity may be different, causing your weight to be different.

  11. Various Values of g and Effect on Weight Weight on Earth Weight on other Planets

  12. A Side-by-Side Comparison

  13. A Cheesy (but Effective) Video Comparison

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