1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Frictional Forces Problem

  1. Dec 13, 2011 #1
    1. The problem statement, all variables and given/known data

    A force of 400 newtons is applied horizontally to a box. The kinetic coefficient of friction is .64 and the acceleration of the box is 4 m/s^2. Find the mass and the force of friction.

    2. Relevant equations
    assume that acceleration due to gravity or g=10 m/s^2


    3. The attempt at a solution
    please explain!!
     
  2. jcsd
  3. Dec 13, 2011 #2

    Simon Bridge

    User Avatar
    Science Advisor
    Homework Helper
    Gold Member
    2016 Award

    Welcome to PF.
    Did you draw the free-body diagram?

    There should be four forces on it.
    Are the forces balanced?
    Are any of them related to each other?
     
  4. Dec 13, 2011 #3
    yeah i drew the free body diagram and have that there are four forces but im having trouble finding the normal force without knowing the mass since i need it to find the force of fricition
     
  5. Dec 13, 2011 #4

    Simon Bridge

    User Avatar
    Science Advisor
    Homework Helper
    Gold Member
    2016 Award

    Write everything out as symbols - use algebra to get an equation that says "m=" a bunch of symbols. Then put the numbers in.
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook




Similar Discussions: Frictional Forces Problem
  1. Friction problem (Replies: 8)

  2. Friction problem (Replies: 1)

  3. Friction Problem (Replies: 0)

Loading...