Normal and Frictional Forces

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Presentation transcript:

Normal and Frictional Forces Physics 20 Normal and Frictional Forces

Normal Force -Fn The supporting force exerted by a lower surface on an upper surface. Basically – the force acting against the force of gravity to balance it. Drawing page 179 – SNAP book The normal force always acts perpendicular to the surface of the object it is acting on. The normal force acts against the force of gravity to balance it out so Fn = Fg = mg

Frictional Forces Act in the opposite direction of motion Depend on The normal force The nature of the two surfaces (μ) Coefficient of friction μs = coefficeint of static friction μk = coefficient of kinetic friction Basically, it takes more force to get an object moving than to keeping it in motion once it has started moving. That is the difference between the coefficients

Force of Friction Ff = μFn Ff = Force of friction Fn = Normal force μ = coefficient of friction Example: A 7.6 kg object is pulled along a horizontal surface. If the coefficient of friction between the surfaces is 0.20, what is the force of friction?

Assignment Reading Questions Pearson Physics pgs 169 – 189 SNAP Pg 181 -183: #’s 1-5