所以摩擦力做负功-，转化成热能。
当我像这样做负功时，重力做正功。
When I do negative work, like I do now, gravity does positive work.
当我做正功的时候，重力做的是负功。
重力做负功，如果我做负功。
如果我做正功，重力做负功。
因此不管何时重力,做正功，我就做负功。
So whenever gravity is doing positive work, I would be doing negative work.
放下来，我坐了负功。
如果把它举在手中，当我做正功时，重力就做负功。
If I hold it in my hand, when I'm doing positive work, gravity is doing negative work.
物体向上，做负功，现在，看这个方程，如果你想要，看这里。
Object goes up, it does negative work, Now, look at that equation, and look, if you want to, here.
讨论滑动摩擦力作功，说明了滑动摩擦力可以使刚体的平动动能和转动动能之间相互转换，但总是作负功。
It is pointed out that translational kinetic energy and rotational kinetic energy mutually transferred by sliding friction force, but it only has positive acting.
正是有这一相位差，才使强迫力对振动系统所做的功正好抵消阻尼力对振动系统所做的负功，以保证稳定振动的等幅性。
This leads to the result that the work of force counteracts the work of damp force, and that the swing of steadily oscillation is the same.
总功是负的，所以是椭圆轨道。
因此，唯一成功的“反对贫困的战争”就是一方面扫清各种可能妨碍节俭的障碍，一方面废除各种可能导致资本负积累的环境。
The only successful "war against poverty" consists in removing impediments that retard saving and in abolishing conditions making for capital decumulation.
等于负的这些东西的和，因为它们的定义是，环境对系统所做的功。
It's just minus the sum of all these things, because of course these are just defined as the work done by the environment to the system.
具体分析了负能谱系统中“热”的自发传输规律和“热-功”转化规律。
The law of heat spontaneous transfer and the law of heat-work conversion are correspondence between positive energy spectrum(PES) and negative energy spectrum(NES).
具体分析了负能谱系统中“热”的自发传输规律和“热-功”转化规律。
The law of heat spontaneous transfer and the law of heat-work conversion are correspondence between positive energy spectrum(PES) and negative energy spectrum(NES).
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