How to draw a free body diagram

  1. First create a mental picture of the body for which you want to write momentum balance equation.
  2. Draw rough sketch of your system showing it to be isolated from its environment.
  3. Place a dot in the center of the object and at this point all the forces are assumed to be acting upon.
  4. For every force acting on that body , draw a vector which shows size and direction of the force. each vector should start at the dot. 
  5. Label each vector based on the type of force and remember not to include numbers and calculations

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