Express Newton's first, second, and third laws.

Solution 2P

 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. .