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.
For these reasons, Morgellons disease is sometimes referred to as skin crawling disease. The individual with this problem may feel that they have skin mites, springtails (collembola), or scabies that cause the skin sensation. Other symptoms that are sometimes associated with this condition include.