The carriage is driven by a motor, which can exert on it a variable force.
小车是由一个马达控制的，它可以运用于一个变力。
The motion of variable mass system under variable force is studied using air track.
在气垫导轨上研究了变质量物体在变力作用下的运动规律。
Using the variable argument PI control method, the force control of joint is studied.
采用变参数PI控制方法，对关节的力闭环控制进行了试验。
Is the motion with even variable velocity the result of constant force?
匀变速运动是恒力作用的结果吗？
Is the motion with even variable velocity the result of constant force?
匀变速运动是恒力作用的结果吗？
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