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Thursday, 12 June 2014 12:50

C6-17: FRICTION VS. PULLING ANGLE

Additional Info

  • ID Code: C6-17
  • Purpose: Demonstrate how pulling angle affects the frictional force
  • Description:

    A wooden board of weight w, lying on a sandpaper surface, is pulled at an angle a by a string connected to a spring scale. The force F required to move the board is given by: F = w / [ (1/u)cosa + sina]. Differentiating F with respect to a, the minimum force is seen to occur at the angle of repose, u=tana. Pulling horizontally is definitely not the most efficient angle!

    Pull horizontally to determine u, then check the angle of repose by tilting the sandpaper surface. Then pull at a variety of angles to demonstrate that pulling at the angle of repose requires the least force.

  • Availability: Available
  • Loc codes: C6, ME1
Read 1583 times Last modified on Tuesday, 11 August 2020 12:19
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