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.
The term, 'Paresthesia,' refers to a prickling or burning sensation that a person experiences in their feet, legs, arms, or hands; although it may also occur in other parts of their body. The sensation, which can occur without warning, is often painless and has been described as numbness or tingling, 'skin crawling,' or itching.