Some research suggests that individuals who take both vitamin C and zinc at the onset of the common cold experience fewer cold symptoms and recover more quickly than individuals who do not take these nutrients. What is the best explanation of why vitamin C and zinc could reduce the intensity and duration of the common cold?

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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