評論
打印
Step 1: You will need
第一步:你需要準備
Step 2: Aim
第二步:目的
The aim of this experiment is to demonstrate the principle of centripetal force.
這個實驗的目的是為了證明向心力的原則。
Step 3: Method
第三步:方法
Place a small coin, like a 5p piece, inside a deflated balloon. Blow up the balloon and tie a knot in it. Hold the neck of the balloon, where the knot is, in your palm and grip the sides with the fingers of the same hand. Turn the balloon upside down and twirl the balloon to set the coin in motion. The coin may bounce around inside the balloon at first but then it will begin to spin. Is it magic? No! It's science!
手握一枚硬幣,就像5角的那種,放入一個氣球中。吹氣球,然后打結。之后握住氣球的頸部,就是打結的地方，記住用你的手心,用同一只手的手指哦。把氣球顛倒過來,旋轉氣球使硬幣在氣球內部運動。之后這枚硬幣可以在氣球內蹦蹦跳跳,之后開始旋轉。這是魔術嗎?不!這是科學!
Step 4: Conclusion
第四步:結論
So why did this happen? The coin spun around due to a particular force called 'centripetal force' acting upon it. This is a force that pulls an object towards a central point causing it to move in a circular path around that point. Subjected to centripetal force, the coin was constantly seeking its own centre, and so continued to spin.
那么為什么發生這種事呢?這枚硬幣有一種叫做向心力的特別的力量作用。這是一個力,吸引一個物體圍繞著一個中心循環運動。因此受到向心力影響,硬幣是不斷追求自己的中心,因此持續旋轉。
