In mechanics, a force is that which causes a change in velocity or, if you prefer, that which causes an acceleration. When more than one force acts on an object it is the net force that is important. Since force is a vector quantity, use geometry instead of arithmetic when combining forces.
Quick Answer. A crawling sensation felt on the skin may be caused by a condition called morgellons, according to WebMD. Common symptoms of morgellons include feeling like bugs are crawling on the skin, burning, itching and stinging sensations. In some cases skin sores may appear as well.
PROBABLE CAUSE: Menopause. Changes in hormone levels can produce an itchy skin condition called formication. Sufferers have the phantom sensation of insects crawling on their skin, though itâs not clear why. One theory is that fluctuating hormone levels may affect nerve endings in the skin.