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Forces, Forces Everywhere. An investigation of frictional forces around us. Forces. Newton’s 2 nd 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.

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Forces forces everywhere

Forces, Forces Everywhere

An investigation of frictional forces around us


Forces
Forces

  • 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


Nonconservative forces
“Nonconservative” Forces

  • 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


Purpose
Purpose

  • 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).


Hypothesis
Hypothesis

**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?


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