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1. The primary inertia force is the force that acts on an object when it is at rest ormoving with a constant velocity.
主要惯性力是物体静止或以恒定速度运动时所受的力。
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2. In the study of motion, the primary inertia force is the force that opposes the acceleration of an object due to gravity.
在运动研究中，主要惯性力是物体因重力而产生加速度时所受到的力。
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3. The primary inertia force is also known as the first law of motion, which states that the net force actingon an object is equal to its mass times its acceleration.
主要惯性力也被称为第一定律运动，该定律指出作用在物体上的净力等于物体的质量乘以其加速度。