Saya tidak tahu bagaimana saya ini tampak di dunia, tetapi saya sendiri merasa hanyalah seorang bocah laki-laki yang bermain di pantai, dan lari mondar-mandir ke segala arah dari waktu ke waktu untuk menemukan batu kecil yang lebih halus atau kerang yang lebih cantik dari biasanya, sementara samudera kebenaran terbentang di depanku penuh rahasia.
Jumat, 15 Januari 2010
WORK, ENERGY AND POWER
WORK, ENERGY AND POWER
Imagine a porter carrying a load on his head. Is he doing any work? Yes, one would say! He would be paid for carrying that load from one place to another. But in terms of Physics he is not doing any work! Again, imagine a man pushing a wall? Do you think he is doing any work? Well, his muscles are contracting and expanding. He may even be sweating. But in Physics, we would say he is not doing any work!
If the porter is carrying a very heavy load for a long distance, we would say he has lot of energy. By this, we mean that he has lot of stamina. If a car can run at a very high speed, we say it is very powerful. So, we relate power to speed. However, it means something different in Physics. Let us understand what is meant by work, power and energy in Physics.
Work
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