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.
Patients may also resort to using harmful chemicals in an attempt to make the itching go away. The best course of action to diagnose and treat skin crawling is to seek professional help. Doctors may take skin samples to find the cause of the abnormal skin sensation and will conduct a full checkup. If no actual parasites are found, the patient may be referred to a psychiatric professional.