Irregularities on the two surfaces lock into one another
Answers
heya,
It is an opposing force that opposes the motion of one body over the surface of another body. Like in case of a ball freely rolling on the ground, the ball eventually comes to stop, because of the force of friction that acts between the ball and the ground. This means that if force acts from right to left, friction acts in left to right direction. Alternatively, if force acts from left to right, friction acts in right to left direction. It comes in notice only when two surfaces are in contact with each other it is called Contact force. It is offered by solids, liquids as well as by gases but it is maximum in the case of solids and least in the case of gases.
Causes of Friction
The causes of friction are molecular adhesion, surface roughness and the ploughing effect. Every object has a rough surface, though the surface may appear to be smooth to the naked eye. But when we observe through a microscope, we find that the surfaces of all the objects have rough edges. Some of the particles on the surface of objects are in the form of tiny hills and valleys. When a body is pulled over another, these tiny hills and valleys present on both the surfaces in contact get entangled with one another.
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