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Friction is a phenomenon that occurs when a physical body moves in close contact with another body. During this process, a frictional force (*F*t) is generated, which always works against the direction of movement. In the model, a book rests on a table, attached to a set of weights via a pulley system. The weights exert a force on the book, causing it to move. However, the frictional force between the surface of the book and the table resists this movement. A closer examination of the frictional surfaces reveals the molecular composition of both materials. The work required to overcome the frictional force is converted into internal energy, which results in a rise in temperature at the points of contact.
