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A block mass 1.34 kg is pushed up a 30 degree incline with a force of 20.0N parallel to the incline. The coefficiant of kinetice friction between the block and thw incline is 0.20.
A) Find the kinetic friction force on the block.
B) Find the net force that acts on the block up the incline.



Answer :

belali

To the figure below;

A)

  • [tex]F_{n}=mgcos30^o\times k[/tex]
  • [tex]F_{n}=(1.34kg)(9.81m/s^2)(0.2)(\frac{\sqrt{3}}{2})=2.2768N[/tex]

B)

  • [tex]F_{net}=20N-(mgsin30^o+F_{n})[/tex]
  • [tex]F_{net}=20N-(8.8495N)[/tex]
  • [tex]F_{net}=11.150N[/tex]
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