# ch5 - Chapter 5 More Applications of Newtons Laws Forces of...

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Chapter 5 More Applications of Newton’s Laws

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Forces of Friction When an object is in motion on a surface or through a viscous medium, there will be a resistance to the motion This is due to the interactions between the object and its environment This resistance is called the force of friction
Forces of Friction, cont. The force of static friction, ƒ s , is generally greater than the force of kinetic friction, ƒ k The coefficient of friction ( μ ) depends on the surfaces in contact Friction is proportional to the normal force ƒ s μ s n and ƒ k = μ k n These equations relate the magnitudes of the forces, they are not vector equations

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Forces of Friction, final The direction of the frictional force is opposite the direction of motion and parallel to the surfaces in contact The coefficients of friction are nearly independent of the area of contact
Static friction acts to keep the object from moving If increases, so does If decreases, so does ƒ s μ

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ch5 - Chapter 5 More Applications of Newtons Laws Forces of...

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