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Mass vs. Weight

Mass vs. Weight. Definitions. We tend to use the terms mass and weight interchangeably, but they are not the same thing. Mass is the amount of matter in an object. Weight is a measure of the pulling force of gravity on an object. How to Find Mass. To find mass we use a Balance .

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Mass vs. Weight

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  1. Mass vs. Weight

  2. Definitions • We tend to use the terms mass and weight interchangeably, but they are not the same thing. • Mass is the amount of matter in an object. • Weight is a measure of the pulling force of gravity on an object.

  3. How to Find Mass To find mass we use a Balance. This means you comparing the mass of one object to the established mass of another object

  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. Calculating Weight g = force of gravity g= 9.81 N/kg (on Earth) To calculate the weight, w, of an object of mass m: w = mx g= m x 9.81

  6. Example Calculations 1. 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

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

  8. Various Values of g and Effect on Weight Newton’s Law of Universal Gravitation is: Weight on other Planets A more simplified form of this equation (when applied to gravity is the familer….)

  9. A Side-by-Side Comparison

  10. A Cheesy (but Effective) Video & Song Comparison

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