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4. Physics and Natural Laws

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11. Friction

Maximum Tread Contact = Maximum Friction

Friction is a force caused by the contact of one surface on another. It results in the resistance of an object moving over a surface. For example, it is easier to move your hand over fine sandpaper than over rough sandpaper because there is less friction caused by the surface of the fine sandpaper.

Friction is:

  • increased by the weight of your vehicle
  • decreased if your tires are over-inflated or under-inflated
  • decreased if the tires are worn smooth
  • affected by the material used to construct the road
  • affected by the condition of the surface of the road (including factors due to weather)

  • Click on pictures to see full-size image

    What is proper tire inflation?


    Lesson Summary


      

    Lesson 4 Quiz


    You will now answer 5 questions to test what you learned during this lesson. You must answer all questions correctly to receive completion credit for this lesson. You may answer the questions as many times as necessary to get them right.

    You should review the lesson material if you don't do well on the quiz.

    1. The best way to maximize the traction of your tires is to:


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    2. According to the formula for stopping distance, how many feet will it take you to stop, from 60 mph?


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    3. Gravity:


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    4. The primary factor in decreasing the Kinetic Energy of an object is to:


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    5. Centrifugal force:


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