Calculating Friction Force

Anonymous
timer Asked: Jan 27th, 2021

Question Description

Key concepts:

  1. Fnet=ma
  2. The friction force Ff is the force that stops things from sliding, Ff=µN, where N is the normal force, and µ (pronounced “mu”) is the coefficient of friction, a constant which depends only on the surfaces in the problem. See table at right
  3. The normal force stops objects from going through each other and always is perpendicular to a surface.
The weight Fg is the downwards force caused by gravity and can be calculated with Fg=mg, where m is the mass and g=10m/s/s is the acceleration of gravity on Earth.
  1. A 5-kg textbook is sliding along the rough (“rough” means there is friction) ground at 20m/s. What is the weight of the book?



  1. Draw the free body diagram on the dot below




  1. What is the normal force pushing on the textbook?



  1. If μ=0.3, what is the friction force?
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  1. What is the net force?
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  1. What is the acceleration?



  1. There is a 500-g aluminum soda can on a steel table. What is the weight of the can?



  1. What is the normal force on the can from the table?
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  1. Use the table above to find μ and calculate the frictional force that would happen if I tried to push the can sideways
  2. a. A 1000-kg car needs -5m/s/s of acceleration to stop in time. Draw the free body diagram for the car, as the tires slow the car down:
    1. How force is needed from friction to stop the 1000-kg car with -5m/s/s of acceleration?
    1. What are the weight and normal force of the car in part (a)?
    1. What is the coefficient of friction needed for the 1000-kg car to get the amount of friction force needed in part (a)?

    1. Would dry concrete give enough friction (see table above)?

    1. What about wet concrete (see table above)?

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