In the second law the force on an object is equal to its mass times its acceleration. Newtons Second Law of Motion Formulae. Newtons Second Law states that the rate of change of momentum of a body is directly proportional to the net force applied on it and this change in momentum takes place in the direction of the applied force.
The first law states that a body at rest tends to stay at rest and a body in motion tends to stay in motion at a constant speed in a straight line unless acted upon by a force.
Newtons laws of motion. Newtons Second Law states that the rate of change of momentum of a body is directly proportional to the net force applied on it and this change in momentum takes place in the direction of the applied force. As we know the rate of change of momentum with respect to time is proportional to the applied force. Velocity is a vector quantity having both magnitude and direction while speed.