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Mass vs Weight

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**Mass Amount of matter in an object Does NOT change with location**

Measured in grams with a balance

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**Weight The force of gravity on an object DOES change with location**

Measured in Newtons with a scale Weight = mass x gravity Fw = mg gearth = 9.8 m/s2 (mass must be in kg) gmoon = 1.6 m/s2 gJupiter = 24.8 m/s2

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Practice Problems Your cat has a mass of 2kg. What is her weight in Newtons on Earth? Fw = mg Fw = 2kg x 9.8 m/s2 Fw = 19.6 N

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**2. What is your cat’s weight on the moon? (g = 1.6 m/s2)**

Fw = mg Fw = 2kg x 1.6 m/s2 Fw = 3.2 N

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**3. What is your cat’s weight on Jupiter? gJupiter = 24.8 m/s2**

Fw = mg Fw = 2kg x 24.8 m/s2 Fw =49.6 N Same size, same amount of stuff (mass), but different gravity

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Gravity Force that acts between any two masses, an attractive force that pulls objects together

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