Friction - is the resistance that is encountered when an object is moved in contact with another.
Example - A work man pushing a box.
1. Jeff (our workman) pushes the box with a force of 25N (newtons) to try to slide it along. It does not move. The friction force exerted on the box is 25N. This exactly balances Jeff's push.
25N right (force applied by Jeff on box) & 25N left (friction of box on ground)
Counter-act each other. Box does not move.
2. Jeff then pushes harder, with a force of 50N. The box still does not move. The friction force exerted by the floor on the box is now 50N. Again, this balances Jeff's push.
50N right (force applied by Jeff on box) & 50N left (friction of box on ground)
Counter-act each other. Box does not move.
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