Ffrict = Âµ â¢ Fnorm. Return to Top. The friction force is the force exerted by a surface as an object moves across it or makes an effort to move across it. There are at least two types of friction force-sliding and static friction. Though it is not always the case, the friction force often opposes the motion of an object.
Answers from Sandhya Pruthi, M.D. No, caffeine doesn't appear to cause breast cysts (fibrocystic breast changes), a noncancerous (benign) breast disease. There's also no evidence to suggest a link between caffeine and breast cancer. Anecdotally, some women report that breast pain symptoms improve when they go off caffeine or reduce the amount of caffeine in their diets. Although no research has documented this effect, it's OK to go to go caffeine-free to see if it relieves discomfort from breast cysts.
Evidence has repeatedly shown that consumption of caffeine does not increase the risk of high blood pressure, heart disease or heart attack. 1  One very well-known study examined more than 85,000 women over a ten-year period and found that there was no increased risk of these diseases, even in women who drank more than six cups of coffee per day.