Physics · Forces and Motion

Conservation of linear momentum is equivalent to Newton's third law of motion. According to Newton's third law, for every action, there is an equal and opposite reaction. This means that when two objects interact, the forces they exert on each other are equal in magnitude and opposite in direction. When considering the conservation of linear momentum, the total momentum of a system of objects remains constant unless acted upon by external forces. This is because the change in momentum of one object is balanced by the change in momentum of another object due to the equal and opposite forces they exert on each other, as dictated by Newton's third law.

Newton's first law of motion, also known as the law of inertia, states that an object at rest will stay at rest, and an object in motion will stay in motion with the same velocity, unless acted upon by an external force. In simpler terms, it means that objects tend to resist changes in their motion. If no force is applied to an object, it will continue to move at a constant speed in a straight line or remain at rest. This law helps us understand why we feel a force when a moving vehicle suddenly stops or accelerates. 

Newton's second law of motion states that the acceleration of an object is directly proportional to the net force acting on it and inversely proportional to its mass. In simpler terms, it means that the greater the force applied to an object, the greater its acceleration will be. Additionally, the more mass an object has, the less it will accelerate for a given force. This relationship is described by the equation F = ma, where F represents the net force, m represents the mass of the object, and a represents its acceleration. 

Conservation of linear momentum is equivalent to Newton's third law of motion. According to Newton's third law, for every action, there is an equal and opposite reaction. This means that when two objects interact, the forces they exert on each other are equal in magnitude and opposite in direction. When considering the conservation of linear momentum, the total momentum of a system of objects remains constant unless acted upon by external forces. This is because the change in momentum of one object is balanced by the change in momentum of another object due to the equal and opposite forces they exert on each other, as dictated by Newton's third law. 

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