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Atoms can never really touch each other.
The strength of these bonds depends obviously on the nature of the atoms that bond. If now the two objects move with respect to each other, these bonds will have to be broken, and energy will have to be consumed for this purpose. We view this, as if the larger the force of friction will be. The heavier the upper object, the larger the force of friction. In this case, obviously, as seen from the equation above, the coefficient of friction depends only on the force that keeps the two objects pressed against each other, and on the nature of the objects.