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Which component turns the arm?

A force F = (0, 5, 0) N acts at position r = (0.30, 0.40, 0) m relative to a pivot. Use right-handed axes.

Find the z component of torque about the pivot.

Organize the givens & assumptions
  • r = (0.30, 0.40, 0) m
  • F = (0, 5, 0) N

The point of application and force are specified in the same fixed Cartesian frame.

  1. A+1.5 N m+1.5\ \mathrm{N\,m}
  2. B+2.5 N m+2.5\ \mathrm{N\,m}
  3. C−1.5 N m-1.5\ \mathrm{N\,m}
  4. D+2.0 N m+2.0\ \mathrm{N\,m}

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