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Frictional Forces

Frictional Forces. Friction is a type of force that opposes the motion of objects. There are two types of frictional forces: Kinetic - the force of resistance on an object that causes the object to stop moving . Static - the force of resistance on an object that prevents motion .

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Frictional Forces

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  1. Frictional Forces Friction is a type of force that opposes the motion of objects. There are two types of frictional forces: • Kinetic- the force of resistance on an object that causes the object to stop moving. • Static- the force of resistance on an object that prevents motion.

  2. For example, pushing a car in neutral gear is hard to do….even more difficult if the car is stopped. Pushing a car through snow is even harder!

  3. The strength of these frictional forces depends on: • The mass of the object • The type of surface the object is in contact with (rough or smooth) • The shape of the object (round for rolling or aerodynamic)

  4. Coefficients of Friction A ratio of the magnitude of friction to the normal force on an object. m = Ff FN Where m is just a ratio (number with no units)

  5. Coefficient of Static Friction is the ratio that must be overcome in order to just get the object to start moving. ms = Fs FN Coefficient of Kinetic Friction is the ratio that must be overcome in order to keep the object moving. mk = Fk FN

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