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.
Itchy Skin: Imaginary Bugs Often Blamed. May 16, 2011 -- People with a âdelusional bug syndromeâ are convinced that bugs, worms, germs, or other creepy crawlers are infesting their skin and often see skin doctor after skin doctor to find out what is causing the infestation. Often, patients bring in samples of the insect and request a skin biopsy.