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Forces, Forces Everywhere

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Forces, Forces Everywhere

An investigation of frictional forces around us

- Newton’s 2nd law: F=m*a
- Weight is an example of Force
- Gravity is an example of Acceleration

- Forces can be described by the direction in which the acceleration acts
- Forces acting on surfaces
- Normal Force

- Friction
- Proportional to the normal force
- Exists for motionless and moving objects.
- Ff=μN

- Drag
- Proportional to velocity of fluid or object
- Fd=(½)ρv2CdA
- Density, velocity, drag coefficient, area

- We will experiment with friction by examining the force needed to move two surfaces past each other, and analyze the force-position data to calculate frictional coefficient(s).

**Think about these questions**

Will the roughness of the wheels and sliding surface (floor) have an effect on the force required to move the car?

How are we comparing surface roughness?