牛顿三定律(国外英文资料).doc

牛顿三定律(国外英文资料) Newton first law of motion Without any object by force or by external force is zero, their movement remains the same, including the state of uniform motion in a straight line acceleration is always equal to zero and the stationary state, until it has the external force to force it to change this state. Description: the object has to maintain static and the trend of a uniform motion in a straight line, thus the objects motion state is determined by its speed, no external force, its motion state is never change. The nature of the object to keep their movement status unchanged called inertia (inertia). So the Newtons first law also known as the law of inertia (the law of inertia). The first law also illustrates the concept of force. It is clear that force is the interaction between objects, pointing out that force changes the motion of the object. Because the acceleration is the change in the motion of the object, the force is associated with the acceleration, not the velocity. This is often an illusion in daily life. Note: Newtons first law was not established in all reference frames, but it was actually only found in the frame of reference. Therefore, it is often true that Newtons first law was established as a criterion for the frame of reference of the frame of reference. Newtons first law was made by analyzing facts and then summarizing and reasoning further. All the objects around us have to be affected by this force or that force, so we cant use experiments to directly verify the law. Everything from law inference, however, have to withstand the test of practice, therefore, Newtons first law has become a generally accepted that one of the basic law of mechanics. Newton second law of motion The acceleration of an object is proportional to the external force of the object, which is inversely proportional to the mass of the object, and the direction of acceleration is the same as that of the external force. The formula: F (= k) = kma (when F (), m, a