Mechanical energy is conserved, because gravity is a conservative force.
机械能是守恒的，因为重力是守恒力。
It should make no difference because gravity is a conservative force.
这没有区别,因为重力恒定。
And mechanical energy is only conserved if the force is a conservative force.
机械能只有在，力是恒定时才恒定。
The conservative force and the gradient of the potential energy are dual vectors.
保守力与势能梯度互为对偶矢量。
The conservative force and the gradient of the potential energy are dual vectors.
保守力与势能梯度互为对偶矢量。
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