How does friction relate with Newtons laws of motion?

I need to know how friction relates with Newtons laws of motion

i think the 3d law in perticularHow does friction relate with Newtons laws of motion?Friction is a force

If you look at the 3 equations of motion you will see that force is mentioned in all 3 ( even though it is called an action or reaction in the 3rd)



1. (Inertia) Every object is in a state of rest or uniform motion in a straight line unless acted upon by an external force



2. The rate of change of momentum of an object is directly proportional to the applied force.



3. For every action there is an equal and opposite reaction.

How does friction relate with Newtons laws of motion?newtons third law can be applied only to two interacting bodies

so we have to know another thing which interacts with this body on which the frictional forces are acting so that we can find the reaction of this frictional force on body(if this is action) or to find the force for which this frictional force might be reaction.How does friction relate with Newtons laws of motion?The 3rd law : F = m*a



m*a gives you the net force.

if friction is present, you will have to subtract the friction force from the applied force to find me, thus, gives us a new equation : F - Ff = ma



(Ff = Friction force)



hope that helps ;)