Newton's 2nd Law: Kinetic and Static Friction. Level 2, Example 2

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Newton's 2nd Law: Kinetic and Static Friction. Level 2, Example 2

Two boxes are slowly lowered down a ramp by pulling on a rope attached to the lower box, as in the figure. The boxes move together at 15.0 cm/s and the rope is parallel to the ramp. If the coefficients of friction are μk = 0.444 and μs = 0.800, find (a) the tension in the rope and (b) the magnitude and direction of the friction force on the upper box.
  1. JHughesPhysics
  2. static friction
  3. kinetic friction
  4. newton's second law
  5. Newton's laws
  6. normal force
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Explanation was very straightforward and clear... Thank you @JHughesPhysics

profanityking
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you can define the positive direction to be any direction you like, right? but when I try this with up the ramp being the negative I get -f+(mgsin27.8°)=0. which gives me the right newtons but the friction force is pointing in the positive direction. which is wrong, right ?

joseocampo
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Why do you only draw 2 FBD? i drew both m2 and m1 and couldnt do it cuz my friction of m2 didnt match the friction that it was supposed to have on m1

Lazaruszzz
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Why the magnitude of the upperbox is not 140*0, 8 (coefficient of static friction) ?

YourAnimeMusicVideo
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why use cos instead of sine? need help pleasssseeee

trishaann