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    heyyalliee's Avatar
    heyyalliee Posts: 37, Reputation: 1
    Junior Member
    		  
    #1

    Sep 29, 2010, 03:50 PM
    Static Friction and Mass help?!
    A 45- crate is placed on an inclined ramp. When the angle the ramp makes with the horizontal is increased to 30 , the crate begins to slide downward.

    Q1:What is the coefficient of static friction between the crate and the ramp?
    I got that answer and it was .58

    It's the second I need help with;
    Q2:At what angle does the crate begin to slide if its mass is doubled?

    I don't even know where to start to find that.. any help greatly appreciated.
    Unknown008's Avatar
    Unknown008 Posts: 8,076, Reputation: 723
    Uber Member
    		  
    #2

    Sep 29, 2010, 10:36 PM

    You need to find the angle where the component of the force due to gravity will equal the frictional force.





    Equate those two, and solve for theta.

    Post what you get :)
    heyyalliee's Avatar
    heyyalliee Posts: 37, Reputation: 1
    Junior Member
    		  
    #3

    Sep 30, 2010, 11:10 AM

    I set them equal to each other and got 30 degrees.
    I plugged it into my online homework site and it was right!

    Thank you so much!
    Unknown008's Avatar
    Unknown008 Posts: 8,076, Reputation: 723
    Uber Member
    		  
    #4

    Sep 30, 2010, 11:18 AM

    You're welcome :)
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