1. Not finding help here? Sign up for a free 30min 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!

A brick is sliding down a ramp

  1. Jan 5, 2009 #1
    1. The problem statement, all variables and given/known data

    A brick is sliding down a ramp

    Anet / acceleration = .5 m/s^2
    m= 2 kg
    M = the coefficient of friction = unknown or ?

    3. The attempt at a solution

    I'm just stuck on the last part

    well first this is my work so far:

    90-delta=
    90 - 35 = 55

    Fg= (2)(-9.8)
    Fg= -19.6

    Fg x = Fg cos (-) or -19.6 cos 55 = -11.2
    Fg y = Fg sin (-) or -19.6 sin 55 = -16.1

    Fn= 16.1
    ---------------

    This is where i get stuck.
    I don't know how to find M from here
    please help me T-T
     
    Last edited: Jan 5, 2009
  2. jcsd
  3. Jan 5, 2009 #2

    jgens

    User Avatar
    Gold Member

    What quantity is M supposed to designate?
     
  4. Jan 5, 2009 #3
    M = the coefficient of friction
    idk if that helps? :(
     
  5. Jan 5, 2009 #4

    jgens

    User Avatar
    Gold Member

    Well, since the coefficient of friction is defined as M = (Ff/Fn), all you need is to calculate the friction force.
     
  6. Jan 5, 2009 #5
    last question how do i calculate the friction force? :[
     
  7. Jan 5, 2009 #6

    jgens

    User Avatar
    Gold Member

    Well you know the acceleration of the block and its mass, so first you need to apply Newton's second law to find the net force acting on the block. Then using what you know about the net force calculate the friction force. Fnet = Fgx - Ff.
     
  8. Jan 6, 2009 #7
    okay i think i got it now

    THANK YOU SO MUCH<3333333333
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?



Similar Discussions: A brick is sliding down a ramp
Loading...