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.
Medications - A crawling sensation on the skin is a common side effect of Ritalin or Adderall. Some prescription drugs may also list this as a side effect. Taking amphetamines or cocaine can also cause a crawling sensation on the skin. Withdrawal Symptoms - When a patient is experiencing withdrawal from opioids, amphetamines or cocaine it can cause the patient to experience a skin crawling sensation.