Newton's first law states that an object will remain at rest or in motion at a constant velocity unless acted upon by an external force. Newton's second law states that the acceleration of an object is directly proportional to the net force acting on it and inversely proportional to its mass. Newton's third law states that for every action, there is an equal and opposite reaction.
Friction is a force that opposes motion and it is accounted for in the second law of motion. The greater the friction, the more force is needed to overcome it and maintain motion. Additionally, friction can also cause objects to come to a stop due to the force of friction being greater than the applied force.
The force of friction can be calculated using the formula F = μN, where F is the force of friction, μ is the coefficient of friction, and N is the normal force. The coefficient of friction varies depending on the surfaces in contact and the force of the normal force is perpendicular to the surface of contact.
Static friction is the force that prevents two surfaces from sliding against each other when there is no motion. It can be overcome by increasing the applied force. Kinetic friction, on the other hand, is the force that opposes the motion of two surfaces sliding against each other. It is generally less than static friction and remains constant once an object is in motion.
According to Newton's third law, for every action, there is an equal and opposite reaction. In the case of friction, when an object is in motion, the force of friction acts in the opposite direction to the motion. This is because the object exerts a force on the surface it is in contact with and the surface exerts an equal and opposite force back, resulting in the force of friction.
