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3.2 Weight, Gravity, and Friction

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Presentation on theme: "3.2 Weight, Gravity, and Friction"— Presentation transcript:

1 3.2 Weight, Gravity, and Friction
How does increasing the mass of the car affect its acceleration?

2 Key points Gravity Weight Definition Formula Friction Cause Types

3 Gravity Force that pulls every mass toward every other mass.
Downward force Depends on mass Less on Mars More on Earth 9.8 m/sec2

4 Weight Force created by gravity on an object Changes with location
Formula If you have… And you need… Fw = mg Mass and gravity Weight m = Fw / g Weight and gravity Mass g = Fw / m Weight and mass Gravity

5 Friction Forces caused by motion between objects (microscopic hills and valleys) Work against motion that produces them Reduces acceleration All machines have Types: Air Viscous Sliding Rolling


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