Isolated particles remain stationary or move in a straight line at a uniform speed; When any object is not affected by external force or balance force, it always stays still or moves in a straight line at a constant speed until an external force acts on it, forcing it to change this state. Inertia is only related to mass, and has nothing to do with speed and roughness of contact surface. The greater the mass, the greater the work done to overcome inertia; The smaller the mass, the less work can be done to overcome inertia.

2. Newton's second law of motion

The acceleration of an object is directly proportional to the resultant force acting on the object and inversely proportional to the mass of the object, and the direction of acceleration is the same as that of the resultant force.

3. Newton's third law of motion

The force and reaction between two interacting particles are always equal in size and opposite in direction, and act on the same straight line.

What are the legal implications of Newton's three laws?

Newton's law of motion is an important law in mechanics and the basis for studying classical mechanics and even physics. The basic laws of motion in classical mechanics are expounded. The application scope of this law is the inertial reference system given by Newton's first law of motion, which makes it meaningful for people to study physical problems and measure physical quantities.

Newton's law of motion refuted Aristotle and others' wrong views on the concept of force, which lasted for more than two thousand years and laid the foundation for establishing a correct concept of force. This law scientifically defines several basic concepts in classical mechanics such as inertial mass and force, and lays a conceptual foundation for the principle of particle mechanics system established by Newton's law of motion.