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.
Skin. Even light methamphetamine use can cause widespread acne due to the drug's effects of dry skin and extreme itchiness. Coupled with the common sensory hallucination factor of 'bugs crawling beneath the skin,' this often promotes obsessive scratching, picking, and resulting in many small sores and facial scarring.kin. Even light methamphetamine use can cause widespread acne due to the drug's effects of dry skin and extreme itchiness. Coupled with the common sensory hallucination factor of 'bugs crawling beneath the skin,' this often promotes obsessive scratching, picking, and resulting in many small sores and facial scarring.