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Physics

Physics. Force. Force. 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. Newton’s Laws of Motion. 1st Law - Law of Inertia

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Physics

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  1. Physics Force

  2. Force • 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

  3. 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

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

  5. 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) Ffric = mFnorm Friction may be static (starting or kinetic (moving) You may use subscripts to indicate this. ie. ms or mk

  6. CONTACT FORCES FRICTIONAL TENSIONAL NORMAL AIR RESISTANCE APPLIED SPRING

  7. AT A DISTANCE FORCE GRAVITATIONAL ELETRICAL MAGNETIC

  8. Normal force (Fnorm) Applied(Fapp) (Force on hanger) Friction force (Ffric) Gravity (Fgrav) (Force on plane)

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

  10. Normal force Incline(components) Applied (Force on hanger) Wy =Wcos Friction force Wx =Wsin Gravity (Force on plane)

  11. Incline(equations) Normal force Applied (Force on hanger) Wy =Wcos Friction force Wx =Wsin Weight (Force on plane) Fy = 0 Fx = 0 As long as the object is sitting still or at constant acceleration Fapp - Ffric - Wsin = 0 Fnorm - Wcos = 0 Fnorm = Wcos Fapp = Ffric + Wsin Ff = N

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