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Forces and Motion

Developing Essential Skills for State Standards

Gravity: K-12 TLC Guide

Quests Quests
PAGE ONE
What Is Force? 		PAGE TWO
Unbalanced Forces 		PAGE THREE
Mass and Inertia 		PAGE FOUR
Gravity 		PAGE SIX
Drag 		PAGE SEVEN
Erosion
Answer Sheet State Standards Quest Archive
PAGE FIVE: Friction
  1. Use this glossary to find a definition of friction from NASA and answer this question:
    2.

    1. What forces of friction might slow down a person on a bicycle?

        2. A.    Wind.
        B.    The wheels against the surface.
        C.    An unoiled chain.
        D.    All of the above.
        E.    None of the above.



  2. Use this screen from the BBC to observe the results of the sleigh moving on four different surfaces (vinyl, wood, carpet, ice), take the quiz and answer these questions:
    3.

    1. What causes an object to slow down as it glides or rolls across a surface?

        2. A.    Inertia.
        B.    Gravity.
        C.    Friction.
        D.    All of the above.
        E.    None of the above.

    2. Why would a bobsledder wax the runners of her sled?

        3. A.    To increase the sled's inertia.
        B.    To decrease the force of gravity.
        C.    To decrease the friction between the runners and the surface.
        D.    To decrease wind resistance.

    3. Why is hockey played on ice rather than on a wooden floor?

        4. A.    To increase the skaters' inertia.
        B.    To decrease the force of gravity.
        C.    To decrease the friction between the skates and the surface.
        D.    To decrease wind resistance.

    4. Adding oil to a surface helps to:

        5. A.    Reduce friction.
        B.    Increase friction.
        C.    Remove gravity.
        D.    All of the above.
        E.    None of the above.

    5. Friction can be useful when it:

        6. A.    Helps keep vehicles from sliding on icy roads.
        B.    Helps slow down an airplane that is landing.
        C.    Helps prevent a person from sliding down a steep hillside.
        D.    All of the above.
        E.    None of the above.

    6. Which of these statements are true?

        7. A.    Friction only occurs between two solid objects.
        B.    Only rough surfaces create friction.
        C.    Friction exists between any two surfaces that come in contact.
        D.    All of the above.
        E.    None of the above.

    7. Which of these statements are FALSE?

        8. A.    Friction only slows things down.
        B.    Water and air can be sources of friction.
        C.    Friction can stop things from moving.
        D.    All of the above.
        E.    None of the above.



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This TLC Quest last edited 01/13/2007
This TLC Quest last revised 12/31/2006
This TLC Quest created 12/31/2006