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Wednesday, August 28, 2013

A Little Bit of Physics: My Notes on Newton's Laws, Forces, Work, Energy, Power, Impulse, and Momentum

Some note's I typed down on Evernote while studying. This would be really hard to explain since I am not very good in physics, I'm really bad at it actually, so I compiled all of the equations to memorize and decided to share it here. Good luck studying!





Newton's Laws of Motion:


  1. Objects will stay at rest or remain in motion unless an unbalanced force opposes it.
  2. An unbalanced force on an object will cause it to accelerate.
  3. For every action there is an opposite and equal reaction force.

Forces:


  • Equilibrium = Net Force = 0
  • Weight = Mass x Gravity
  • Force = Mass x Acceleration
  • Normal Force = Mass x Gravity + Mass x Acceleration
  • Static Friction = Coefficient of Friction x Normal Force

Work and Energy:


  • Work (Joules) = Force x Displacement
  • Work = (Force's Cos[theta]) x Displacement
  • Kinetic Energy = 1/2 x Mass x Velocity^2
  • Work = Final kinetic - Initial kinetic
  • Gravitational Work = Mass x Gravity x (Initial Height - Final Height)
  • Potential Energy = Mass x Gravity x Height
  • Power (Watts) = Work / Time
  • 1 Horsepower = 745.7 Watts
  • Power = Force x Velocity

Principle of conservation of energy
: Energy can be changed but can not be created or destroyed.

Impulse and Momentum:


  • Impulse (J) = Force x (Final time - Initial Time)
  • Linear Momentum (P) = Mass x Velocity
  • Impulse = Initial momentum - Final Momentum

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