名词
中文翻译：Unknown
同义词：
['norm', 'standardforce', 'average force']
例句：
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1. The normal force of gravity isabout 9.8 meters per secondsquared.
重力的正常作用力约为每秒平方9.8米。
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2. Thenormal force between two objectsis equal to the product oftheir masses and the acceleration due togravity.
两个物体之间的正常作用力等于它们的质量和由于重力引起的加速度的乘积。
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3. The normal force on a surface isthe force that pushes down on itwhen an object is placed on it.
表面受到的正压力是当物体放置在表面上时，对表面施加的推力。