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.
2 I have numbness on my lower back and abdomen and my skin is crawling. Dr. David Lipkin Dr. Lipkin. 1 doctor agreed: Not usually: Numbness and skin crawling sensations are not likely to be caused by Adderall and aren't listed as a side effect.