Calculating Friction Force
Question Description
Key concepts:
- Fnet=ma
- 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
- The normal force stops objects from going through each other and always is perpendicular to a surface.
- 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?
- Draw the free body diagram on the dot below
- What is the normal force pushing on the textbook?
- If μ=0.3, what is the friction force?
- What is the net force?
- What is the acceleration?
- There is a 500-g aluminum soda can on a steel table. What is the weight of the can?
- What is the normal force on the can from the table?
- Use the table above to find μ and calculate the frictional force that would happen if I tried to push the can sideways
- 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:
- How force is needed from friction to stop the 1000-kg car with -5m/s/s of acceleration?
- What are the weight and normal force of the car in part (a)?
- What is the coefficient of friction needed for the 1000-kg car to get the amount of friction force needed in part (a)?
- Would dry concrete give enough friction (see table above)?
- What about wet concrete (see table above)?
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