There are 3 types of friction: Static, Limiting and Kinetic Friction. Therefore, the adhesive pressure increases, and so does the force of friction. When the surfaces in contact are extra smooth, the distance between the molecules of the surfaces in contact decreases, increasing the adhesive force between them. Because with an increase in the area of contact, the force of adhesion also increases. I Frictional force is unaffected by the contact area. It is the force that comes into play when two surfaces come into contact with each other and oppose their relative motion. This proves the principle of conservation of linear momentum.įriction is an opposing force that comes into play when one body actually moves (slides or rolls) or even tries to move over the surface of another body. Which shows that the total final linear momentum of the isolated system is equal to its total initial linear momentum. It is a vector quantity having SI unit Newton (N) and dimension \ Two bodies exert forces on each other even if they are not physically in contact, e.g., the electrostatic force between two charges or gravitational force between any two bodies. An interaction between two bodies is also referred to as force. A force is something that causes a body's rest or motion to alter.
