In ordinary stripping operations, the pipe falls into the wellbore under its own weight, and no additional downward force or pushing is required.

在平常的不压井起下钻作业中，管柱下入井眼是依靠其自身重量，不需要附加的向下载荷或者推力。

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Moreover, the effect of real gas for small angle-of-attack case results in small downward force moment, whereas that for large angle-of-attack case results in small upward force moment.

此外，小攻角时真实气体效应产生小低头力矩，而大攻角时产生小抬头力矩。

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Gravity constantly tugs downward on a slope, but only when gravity's force exceeds the strength of the rocks, soils, and sediments composing the slope does land begin to slide down hill.

重力不断的向下托拽山坡，当重力作用超过岩石、沙子和沉积物的强度，就形成滑坡，并使得地面开始沿着山坡滑落。

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Whenever such a bond occurred, the tip experienced a downward force which was registered by the microscope.

ECONOMIST: Microscopy

The serrated bread knife cuts with a sawing motion instead of a downward force, keeping your sandwich from getting smooshed.

FORBES: No. 1 The Knife

In principle, muscles with shorter fibres ought to exert less downward force, making those who have them less firm on their feet.

ECONOMIST: Anatomy and behaviour