Newton's laws

Weight (Fg​)

The gravitational force the Earth exerts on any object on or near its surface.

Normal force (FN​)

The perpendicular force exerted by a surface on an object in contact with it.

Frictional force (Ff​)

The force that opposes the motion of an object and acts parallel to the surface with which the object is in contact.

Newton's first law

An object continues in a state of rest or uniform (moving with constant) velocity unless it is acted upon by a net or resultant force.

Inertia

The property of an object that causes it to resist a change in its state of rest or uniform motion.

Newton's Second Law

When a net force, Fnet​, is applied to an object of mass, m, it accelerates in the direction of the net force. The acceleration, a, is directly proportional to the net force and inversely proportional to the mass.

Newton's 2nd Law (In terms of Momentum)

The net force acting on an object is equal to the rate of change of momentum.

Newtons Third Law

When object A exerts a force on object B, object B simultaneously exerts an oppositely directed force of equal magnitude on object A.