Work and force

  • Thread starter Grogerian
  • Start date
  • #1
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Homework Statement


A bug slides back and forth in a bowl 11cm deep, the bowl is frictionless except a 1.5cm patch at the *flat* bottom coefficient of friction = .61


Homework Equations


W = f*d
r= 11cm
[tex]\mu=.61[/tex]
stickypatch=1.5cm

The Attempt at a Solution


i can get the first part (its velocity right when it hits the patch [1.47m/s] afterwards I'm stuck i tried using Work = F*d but i get:
W = -.61(mass)(9.81) * .015m

how am i supposed to solve this without the required mass? i tried finding substitutes to put in for mass or to remove mass, but no luck.
 

Answers and Replies

  • #2
tiny-tim
Science Advisor
Homework Helper
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A bug slides back and forth in a bowl 11cm deep, the bowl is frictionless except a 1.5cm patch at the *flat* bottom coefficient of friction = .61

i can get the first part (its velocity right when it hits the patch [1.47m/s] afterwards I'm stuck i tried using Work = F*d but i get:
W = -.61(mass)(9.81) * .015m

how am i supposed to solve this without the required mass? i tried finding substitutes to put in for mass or to remove mass, but no luck.
Hi Grogerian! :smile:

I assume you're using the work-energy theorem …

the mass should appear on both sides, so you can just cancel it at the end. :wink:
 

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