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Math Help - phisics, coefficient of static friction

  1. #1
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    phisics, coefficient of static friction

    i think it involves the pythagorem theorem but not really sure how to apply it. any help would be much appreciated.

    "Mass of wood block without any weight = 5.0 kg; g = 9.8 m/s2"

    "It was observed that the spring scale reached a force of 24.0 N to get the block moving from rest. Calculate the coefficient of static friction between the wood block and the table."
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  2. #2
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    Quote Originally Posted by 14041471 View Post
    i think it involves the pythagorem theorem but not really sure how to apply it. any help would be much appreciated.

    "Mass of wood block without any weight = 5.0 kg; g = 9.8 m/s2"

    "It was observed that the spring scale reached a force of 24.0 N to get the block moving from rest. Calculate the coefficient of static friction between the wood block and the table."
    is the block on a horizontal surface?

    is the applied force parallel to the surface on which the block rests?
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    "A block of wood is dragged across a surface by a spring scale. The scale records the force as mass is added to the top of the block."

    i didnt post that part of the question in the last post. i dont know if that helps, but i dont know the awnser to your question. i was given this question to solve.
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    why, then, did you mention the Pythagorean theorem?
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    Quote Originally Posted by 14041471 View Post
    i think it involves the pythagorem theorem but not really sure how to apply it. any help would be much appreciated.

    "Mass of wood block without any weight = 5.0 kg; g = 9.8 m/s2"

    "It was observed that the spring scale reached a force of 24.0 N to get the block moving from rest. Calculate the coefficient of static friction between the wood block and the table."
    i believe were talking about applied force

    use the frictional force equation;

    mu*m*g=mu*5.0*9.8=49mu=24=24/49=0.489

    plot the values and you will see
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    i need to find the static friction force between the wood and surface, is that what you ment?
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  7. #7
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    Quote Originally Posted by 14041471 View Post
    i need to find the static friction force between the wood and surface, is that what you ment?
    The block is sliding (I assume at constant velocity) therefore F_{net} = \mu R where R is the normal reaction force.

    Getting the value of R is simple and you're given the value of F_{net} (the reading of the spring scale). Substitute the values and solve for \mu.
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