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.
Skin Crawling. The sensation of skin crawling can be extremely distressing. It can cause damage to the skin as well as embarrassment to the person suffering from this condition. The sensation of crawling skin may be similar to that of pins and needles or a tingling feeling. The medical term to explain the crawling sensation on skin is formication.