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  • 1 # 使用者66713277998

    Newton"s second law of motion states that the force needed to accelerate a particle is equal to the product of the mass of the particle and the acceleration produced.牛頓第二定律指:使質點加速的力等於質點的質量乘以力所產生的加速度。也就是F=maThe unit of force is the newton(N). It is defined as the force that will cause a mass of 1 kg to accelerate at a rate of 1 m/s^2力的單位是牛頓N,1N等同於使1kg的物質產生1m/s^2的加速度時所用的力。you usually resolve in the direction of the acceleration and perpendicular to the direction of the acceleration我們通常(將力)分解為一個加速度方向的力和一個垂直於加速度方向的力。the normal reaction is the force which acts perpendicular to a surface when an object is in contact with the surface. In the example on the previous page, the normal reaction is equal in magnitude to the weight of the book反作用力垂直於物體的接觸面,在前頁的例子中,反作用力的大小等於書地重力。

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