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Unit V - Force. Force An interaction between two different objects that results in a push or a pull. An object can’t exert a force on itself. Examples of forces. Friction All friction is parallel to the surface the object is sliding on and opposite the direction of motion

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Force

  • An interaction between two different objects that results in a push or a pull.

    • An object can’t exert a force on itself.

  • Examples of forces


Friction

  • All friction is parallel to the surface the object is sliding on and opposite the direction of motion

  • Static friction, Ffs

    • When the object isn’t moving

  • Kinetic friction, Ffk

    • When the object is sliding


  • Tension

    • The force is always co-linear with the string.

    • The tension is the same everywhere in the string.

    • A pulley simply changes the direction of the force.



    Normal force
    Normal force

    • The normal force is always perpendicular to the surface that’s causing it.


    Force diagrams1
    Force Diagrams

    • Represent all the forces acting on the object using vectors

    • All forces are drawn from the object

    • Represent the object with a dot

    • Use “on-by” notation (on what? by what?)



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