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
• References: REFERENCES: (PIRA unknown.)
• Loc codes: C6, ME1