Matter & Interactions 2nd ed. Practice Problems
Aaron Titus | High Point University
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2k80001     Torque on a beam     2k80001
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Question

 

A 1.5-m beam has a 1-kg object hanging from its end. The beam is held in equilibrium at an angle of with respect to the horizontal, as shown below. To hold the beam in equilibrium, you grasp a handlebar of radius 2 cm at the bottom of the beam and exert a tangential force on the handlebar.


Figure: A beam in equilibrium.

  1. If the mass of the beam is negligible, what is the torque by the object on the beam, about the axis of rotation O?
  2. What magnitude force must you apply tangentially at the handlebar in order to keep the beam in equilibrium?