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17 March, 06:35

A horizontal 20.-newton force is applied to a 5.0-kilogram box to push it across a rough,

horizontal floor at a constant velocity of 3.0 meters per second to the right.

Calculate the coefficient of kinetic friction between the box and the floor. [Show all work, including

the equation and substitution with units]

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Answers (1)
  1. 17 March, 10:18
    0
    The formula to work out the coefficient of dynamic (kinetic) friction is F=uR where F is the force applied, u is the coefficient of dynamic friction, and R is the reaction force. This is based on the principle the object is moving at a constant velocity which is the case in this question.

    Rearranging this we get u=F/R

    Substituting in the values we get u=20/50=2/5=0.4

    Therefore the coefficient of kinetic friction between the box and the floor is 0.4
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