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.
Paresthesia Symptoms. Paresthesia is a prickling or burning sensation which is normally felt in the feet, legs, arms or hands but may as well occur in other parts of the body. This sensation which happens without any warning is normally painless and is usually described as tingling or numbness, itching or skin crawling.