When we walk the work done by friction is negative or positive....?
Friction i a non conservative force and it is path dependent. So then we walk.... How do you walk... push the ground behind and the ground pushes you forward... now the friction is between your feet and ground. now when you push the ground the friction should have a direction in the direction opposite to that of the relative motion of your feet else you would fall down. So friction acts in the forward direction. But when the ground pushed you back.... the point of application of force loses contact so the change in direction of friction doesn't come into play. Hope fully you must have got it....
What are you trying to say? Read my answers once more please, I am making a similar point, I am not considering any change in the direction of the frictional force. And this does not answer the question here. And the doubt was never mine, I was just trying to clear it for the one who asked.
told him the same thing in his nudgebook!!!......and where are the mods !!...can ne 1 delete viper's post !???? ...plzz! ..its unbearable!
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