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一个物体相当于男一个物体位置的改变,叫做机械运动.机械运动是自然界中最基本、最简单的运动形式,物理学将机械运动定义中被选作比较“标准”的“另一个物体”称之为参照物.参照物的选择可以是任意的.但选择不同的物体作为参照物,对运动形式的描述却不尽相同.比如,从匀速飞行的飞机上竖直丢下一颗炮弹,在不考虑空气阻力的情况下,若以地面为参照物,其运行轨迹是抛物线,但若以运动着的飞机作为参照物,炮弹的运行轨迹却是一条直线!
An object is equivalent to a man’s position change of an object, called the mechanical movement.Mechanical movement is the most basic and simple form of movement in nature, physics is selected as the comparison of mechanical motion definition “standard ” “another Objects ”reference. The choice of reference objects can be arbitrary, but the choice of different objects as a reference, the description of the form of movement is not the same, for example, from a plane flying at an average of one In case of air resistance, if the ground is taken as a reference, its trajectory is a parabola. However, if the plane is used as a reference, the trajectory of the projectile is a straight line!