The drag force acts in the opposite direction to the path of the ball.

阻力方向与球的运行方向相反。

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An object remain at rest or moves in a straight line unless a force ACTS upon it.

一个物体如无外力作用，它将继续保持静止或作直线运动。

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In the riser system of offshore platform, the wave force ACTS frequently on the riser.

海上采油平台的垂直立管频繁受到波浪力的作用。

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Gravity is one force that acts on a body without the source of the force actually touching it.

引力是一种受力物体收到了力的作用,但却没有接触施力物体的力

耶鲁公开课 - 基础物理课程节选

I've got to find them by experimenting, by putting other bodies and seeing how they react and then finding out what's the force that acts on a body when it's placed in this or that situation.

我得通过实验找出这些力,我会增加其它物体,观察其反应,求出当它处在这种或者那种情况下时,作用在物体上的力

耶鲁公开课 - 基础物理课程节选

"The Air Force aggressor acts as a hacker coming against us and we see how our defensive plan measured up, " said Lt.

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Irving had been convicted of three counts of rape with force, unnatural acts and kidnapping, Massachusetts State Police said.

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The situation is also bad because these acts disturb the normal current of life and such acts often force us to make radical decisions.

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