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Forces, Forces Everywhere An investigation of frictional forces around us 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 • 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 • 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 **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?