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Diving Board Torque

  1. Jul 11, 2013 #1

    Is there a rule to figure out what direction a force must be applied in a torque problem?
    Here's a specific example with a question:

    In this video, how did he get the direction of F1 and F2? Like how did he know it was pointing upwards or downwards?
  2. jcsd
  3. Jul 11, 2013 #2


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    After awhile, you'll get a good sense a of the direction of the unknown forces in many problems, but otherwise, you can assume a direction. Then when you sum torques about a point = 0, if the force comes out negative, you assumed the wrong direction.
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