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PRACTICE / Kinetic friction

A pull partly lifts the load

A 5 kg box slides right on a horizontal floor. A pull has components 20 N right and 10 N upward; μk = 0.25.

Find its horizontal acceleration.

Organize the givens & assumptions
  • m = 5 kg
  • Fx = 20 N
  • Fy = 10 N
  • μk = 0.25

g = 10 m/s²; box remains on the level floor with zero vertical acceleration; sliding right; constant kinetic friction.

  1. A2 m s−22\ \mathrm{m\,s^{-2}}
  2. B1.5 m s−21.5\ \mathrm{m\,s^{-2}}
  3. C4 m s−24\ \mathrm{m\,s^{-2}}
  4. D6 m s−26\ \mathrm{m\,s^{-2}}

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