1.
Explain the following natural events in terms of the laws of physics that you have learned in this
class. Include figures if necessary.
How does a bird fly?
If you keep boiled egg inside refrigerator, it becomes difficult to take the shell off. But if you
keep it warm water for a minute or so it becomes very easy. Why?
Why inside swimming pool we feel very light weight?
Mention all the laws of physics applied in these processes.
Solution
Why inside swimming pool we feel very light weight?
A person in water feels an upward force which is called the buoyant force , exerted by the water
acting in upward direction. This reduces the apparent weight of the body and therefore we feel
very light inswimming pool.