Friction, Forces, Coefficient of Friction (True/False) Simple

  • Thread starter FAJISTE
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  • #1
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Homework Statement



You are pushing a filing cabinet across a rough floor (μk = 0.41) in a straight line at a constant speed. Which of the following statements about the magnitudes of the forces acting on the filing cabinet are correct?
(T/F)the force that you exert on the filing cabinet will be equal to the frictional force on the cabinet
(T/F) the force that you exert on the filing cabinet will be more than the frictional force on the cabinet
(T/F)if you exerted twice the force, the cabinet would slide at a constant speed that is twice the original value
(T/F) the force that you exert on the filing cabinet will be more than its weight
(T/F)the force that you exert on the filing cabinet will be less than its weight

Homework Equations





The Attempt at a Solution



1. True I assume because it's at a constant speed
2. False I assume because then it would be accelerating?
3. False, I assume it would just be moving faster and accelerating not at constant speed
4. No idea
5. No idea

Help please, some explanations too would be great. I really appreciate it.
 

Answers and Replies

  • #2
288
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The expression for frictional force is

[tex]f_k=\mu_k\mbox{N}[/tex]

N is the normal force and in this case is equal to the weight of the cabinet. This information should help you with the last two questions.
 
  • #3
57
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Sweet, sometimes I'm a little slow, those last two were easy :P
 

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