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Physics Force

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What is force? –Any push or pull that tends to cause a change in motion –measured in Newtons (N) or pounds (lbs) 1 N = 0.225 lbs –examples of force gravity (weight) magnetism electricity tension or compression

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Newton’s Laws of Motion 1st Law - Law of Inertia –An objects motion will remain in motion until acted upon by an outside force. 2nd Law - F = ma –The net force on an object will cause it to accelerate inversely proportional to its mass 3rd Law - Action - Reaction –For every action there is an equal but opposite reaction

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Equilibrium Forces are balanced (1st law) The net force (resultant force) is 0 There is no change in motion –a = 0 –v is constant

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Friction Friction (THEORY GIVEN BY GALILEO)is dependant on 2 factors, the roughness of the surfaces (coefficient of friction) in contact and the force pushing the surfaces together (normal force) F fric = F norm Friction may be static (starting or kinetic (moving) You may use subscripts to indicate this. ie. s or k

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CONTACT FORCES FRICTIONAL TENSIONAL NORMAL AIR RESISTANCE APPLIED SPRING

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AT A DISTANCE FORCE GRAVITATIONAL ELETRICAL MAGNETIC

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Applied(Fapp) (Force on hanger) Normal force ( Fnorm ) Friction force (F fric ) Gravity (Fgrav) (Force on plane) Forcex-componenty-component AppliedFapp0 Gravity0-W Friction-F fric 0 Normal0 N

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Pull(P) (Force on hanger) Normal force ( N ) Friction force (F f ) Weight (W) (Force on plane) Free body diagrams are diagrams that Show all the forces acting on an object Horizontal(equations)

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Applied (Force on hanger) Normal force Friction force Gravity (Force on plane) W y =Wcos W x =Wsin Forcex-componenty-component AppliedP0 Gravity -Wsin -Wcos Friction-F f 0 Normal0 N F = 0P - F f - Wsin = 0 N - Wcos = 0 Incline(components)

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Applied (Force on hanger) Normal force Friction force Weight (Force on plane) W y =Wcos W x =Wsin As long as the object is sitting still or at constant acceleration F y = 0 F x = 0 Fapp - F fric - Wsin = 0 Fnorm - Wcos = 0 Fapp = F fric + Wsin Fnorm = Wcos F f = N Incline(equations)

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Chapter 4 Forces and the Laws of Motion. Chapter Objectives Define force Identify different classes of forces Free Body Diagrams Newton’s Laws of Motion.

Chapter 4 Forces and the Laws of Motion. Chapter Objectives Define force Identify different classes of forces Free Body Diagrams Newton’s Laws of Motion.

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