Express Newton's first, second, and third laws.
Newton's first, second, and third law can be expressed as follows.
Newton’s first law states that a body at rest remains at rest, and a body in motion remains in motion at the same velocity in a straight path when the net force acting on it is zero. Therefore, a body tends to preserve its state of inertia.
Newton’s second law states that the acceleration of a body is proportional to the net force acting on it and is inversely proportional to its mass. For a rigid body of mass , Newton’s second law is expressed as
Where is the net force acting on the body and is the acceleration of the body under the influence of .
Newton’s second law can be also be expressed as == and can be stated as the rate of change of the momentum of a body is equal to the net force acting on the body.
Newton’s third law states that when a body exerts a force on a second body, the second body exerts an equal and opposite force on the first. So, if a body A exerts a force on a second body B, then B simultaneously exerts a force on A, and the two forces are equal in magnitude and opposite in direction. .