What are the differences between Parasympathetic nervous system and sympathetic nervous system

The parasympathetic nervous system responds when the body is relaxed and at rest while sympathetic nervous system is responsible for response to emergency situation.

Explanation:

The sympathetic nervous system is called fight or flight division  while the parasympathetic nervous system is the rest and digest division.The pre-ganglionic neurons of sympathetic nervous system arises from lumbar and thoracic regions of spinal chord while the preganglionic neurons of parasympathetic nervous system arises from the brain and sacral region of the spinal cord.The sympathetic nervous system decreases the activity of digestive system while the parasympathetic nervous system increases the activity of digestive system.Sympathetic nervous system dilates bronchioles while parasympathetic nervous system constricts bronchioles.Sympathetic nervous system increases blood pressure while parasympathetic nervous system usually do not effect  blood pressure.Sympathetic nervous system increases heart rate while parasympathetic nervous system decreases heart rate.

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It depends on the surface of the levels. the rougher the surface, the greater is the frictional force. for rougher surfaces, you would need to exert greater force to move the object. the concept is that, you must overcome the frictional force in order to bring the object into motion. this is the reason why we add lubricants to the joints so they could easily move. this answer was on