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Solving Force Problems. Draw free body diagrams One for each object Choose a coordinate system that simplifies problem Each object can have a separate coordinate system Set up force equations using free body diagrams Identify any action-reaction pairs Solve for the unknowns.

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solving force problems
Solving Force Problems
  • Draw free body diagrams
    • One for each object
  • Choose a coordinate system that simplifies problem
    • Each object can have a separate coordinate system
  • Set up force equations using free body diagrams
  • Identify any action-reaction pairs
  • Solve for the unknowns
slide2
One force diagram per object = 2 diagrams
  • Select Frame of Reference aligned with slopes
  • Two directions, parallel and perpendicular, per object => 2 x 2 = 4 equations of motion
slide4
Solve first equation for T:
  • Substitute into third equation and solve for a
slide5
Substitute values to get numerical answer
  • Since acceleration is negative, we guessed wrong and system moves to the right