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When someone asks me what time it is, I can usually answer before people even start reaching for their phones. It takes a lot less effort to rotate your wrist and move your eyes than take a phone out, press a button, get distracted by notifications and lock your phone again. Also, watch batteries last much longer than phone batteries. Some people l

An automatic watch winds a spring, while a kinetic watch charges a capacitor or battery.

No, but all quality watches have a degree of resistance. Water Resistance is a common mark stamped on the back of watches to indicate how well a watch is sealed against ingress of water. It is usually accompanied by an indication of the static test pressure that the watch was exposed to in a leakage test. For example 5 ATM (Atmospheres). The test p

It's perfect for a beginners. The Nike+ app includes GPS tracking, challenges to keep one motivated, guides with audio, and coaching plans. It also makes it easy to use it with friends.

Yes watch is a very good example of a commodity which fits in all three categories. 

A mechanical watch is so named because it contains inside the outer case, a mechanical movement. Such movements were used in clocks for centuries before being adapted for watches.