物理...重力既問題

其實物體墜下是因為受到引力影響..而地球引力加速度為9.8m/s^2..就系話物體每秒加速9.8米..而引力對物體的作用了計算為W=mg...重量=質量*重力..而地球重力為9.8..所以質量為1kg的物體受到9.8N的力量..用回牛頓第2定律公式..F=ma..9.8=9.8*a..拆解方程加速度a就會=9.8..你可以運用這2條公式去其他物體身上......a必定=9.8..而1榜和100磅物體同時下地是因為他們擁有同樣的加速度..若除去空氣阻力..2個物體會同時下地..你可以用W=mg和F=ma去計算.

In fact, there is a difference in time between the two spheres. The heavier sphere takes longer time to reach the ground. The reasons, apart from air resistance, is the upthrust given by the air on the larger (heavier) sphere is greater than that on the smaller sphere. All these factors will slow down the acceleration of the heavier ball.
It is only because of the difference in time is so small, when the experiment was first done, time recording instruments at that time didn't have such a high precision for the small time difference to be observed.
Should the same experiment be done nowadays with the help of high precision atomic clock, a difference in falling time between the two spheres would be observed.

這是因為重力加速度係等於9.8m/s^2
任何物件在地球自由下落時 加速度等於9.8m/s^2
所以1磅既鐵球同一個100磅既鐵球同時從高處放下,2個鐵球就同時著地
如果在真空既環境之下 一條毛同埋一個鐵球都會同一時間到達地面
但當然正常黎講係冇可能 因為有空氣阻力