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Newton's first law of motion: any object must keep moving in a straight line or at rest at a constant speed until an external force forces it to change its state of motion.

Newton's second law of motion: the acceleration of an object is directly proportional to the acting force, inversely proportional to the mass of the object, and directly proportional to the reciprocal of the mass of the object; The direction of acceleration is the same as that of acting force. ?

Newton's third law of motion: the acting force and reaction force between two interacting objects are always equal in size and opposite in direction, and act on the same straight line.

Extended data

1, the independence of Newton's first law of motion

(1) determines the inertial reference system and leads to the logical cycle argument, which is the expression of the axiomatic system, and the first proposition of any discipline should have this feature.

(2) It is pointed out that any object has inertia, and the concept of inertia is established.

(3) Its negative proposition reveals the concept of output. Force is the action of objects on objects, which changes the motion state of objects.

2. The influence of Newton's first law of motion

(1) refuted the wrong concept of force by Aristotle and others for more than two thousand years for the first time, which laid the foundation for establishing the correct concept of force.

(2) The qualitative definition of force (the essence of force and the function of force) is given scientifically for the first time.

(3) Several basic concepts of classical mechanics were put forward for the first time, which laid a conceptual foundation for the second and third laws of Newton's law of motion and the principle of particle mechanics system.

Baidu encyclopedia-Newton's first law of motion

Baidu Encyclopedia-Newton's Second Law of Motion

Baidu Encyclopedia-Newton's Third Law of Motion