Hey there! Sign in to join this conversationNew here? Join for free
    • Thread Starter
    Offline

    3
    ReputationRep:
    thanks
    Offline

    4
    ReputationRep:
    (Original post by hibaj)
    thanks
    Frictional force is a force that resists movement between two objects. If friction is limiting, it is providing the maximum possible force it can.

    To physically demonstrate this, place your hand on a surface (e.g. a desk) and very lightly try and push your hand along it. You should feel a very small force (Friction) pushing back. This force is not limiting because you are not pushing hard enough. If you push your hand harder, so it moves, then you should feel a bigger frictional force pushing your hand back - and because your hand is moving, this frictional force is limiting (it is the greatest it can be for that movement).

    (Note that the point at which your hand begins to move marks the point at which friction is limiting).
    Offline

    12
    ReputationRep:
    The value of frictional force depends on the applied force to the object. The object "does not want to move" so when you put an applied force, an equal magnitude of frictional force counteracts that (kind of like reaction force). Although, there is a limit to how high the frictional force can be. The maximum value it can have is called the limiting frictional force, which is equals to the constant of proportionality times the normal load. When the applied force has the value which is greater than that, the frictional force does not increase and stays at the value of limiting frictional force. One force is greater than the other, hence the equilibrium is broken and the object moves.
 
 
 
  • See more of what you like on The Student Room

    You can personalise what you see on TSR. Tell us a little about yourself to get started.

  • Poll
    Would you like to hibernate through the winter months?
  • See more of what you like on The Student Room

    You can personalise what you see on TSR. Tell us a little about yourself to get started.

  • The Student Room, Get Revising and Marked by Teachers are trading names of The Student Room Group Ltd.

    Register Number: 04666380 (England and Wales), VAT No. 806 8067 22 Registered Office: International House, Queens Road, Brighton, BN1 3XE

    Quick reply
    Reputation gems: You get these gems as you gain rep from other members for making good contributions and giving helpful advice.