哪些因素令鐘擺速度改變?

哪些因素令鐘擺速度改變?

Update:

要有埋點解: 點解e個因素會影響到

3 Answers

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  • 天同
    Lv 7
    1 decade ago
    Favorite Answer

    The period of oscillation of a pendulum depends on the length of the suspended cord.

    2008-10-29 11:03:15 補充:

    The reason is obvious. The longer the cord, the arc traversed by the pendulum bob will be longer within a fixed angle of oscillation of the suspended cord (length of arc = length of cord x maximum angle of oscillation). The time taken to complete an oscillation is thus longer.

  • Anonymous
    1 decade ago

    T ∝ √(L/g) T=period, L=length, g=gravity

    1. 溫度 - 熱脹冷縮, 熱脹鐘擺長左會慢左, 冷縮反之。

    2. 高度 - 鐘放得越高, 地心吸力越小, 鐘擺會慢左。個鐘擺係喜馬拉亞山頂肯定比地下慢。

    3. 空氣 - 濕度高, 氣壓高, 空氣粒子多(污染), 增加空气阻力, 鐘擺自然慢左。

  • 1 decade ago

    如果鐘擺放在較高的位置然後release,它在最低點時的速度增加,因為mgh=0.5mv^2,h (h是鐘擺和最低點的距離).空氣阻力會令鐘擺末端速度減慢,因為鐘擺最初的勢能,一部分被消耗於work done against friction.如果連繫鐘擺的繩子slacken in tension,即係話tension 既magnitude 不是完全等於mgcos@ (@是鐘擺與vertical 的角度),鐘擺速度會減少(無論是未端速度 or 鐘擺移動中既速度)。實際上鐘擺進行圓周運動,根據T=mv^2/r(向心力=mv^2/r,r是半徑)因此如果T 減少了,v也隨之而下降。同樣道理,如果繩子的長度長D,根據這個公式,鐘擺速度亦會上升。如果放兩個鐘擺,將其中一個鐘擺由高處release,撞向另一個鐘擺果到,如果果個鐘擺表面塗上了層sticky tape,這樣兩個鐘擺的碰撞就成了inelastic collision,被撞果個鐘擺升上去過speed 就會少左。

    Source(s): 已有知識
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