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.
The effects of nicotine itself are similar to that other popular drug, caffeine. See our (nicotine reading list.) There is no evidence that nicotine causes any substantial risk for cancer, and the research shows that the risk for cardiovascular disease is minimal.t seems that some people get substantial benefits that keep them using nicotine, while others do not. Some advocates seem to think that addiction is a terrible disease in itself (despite them not even having a good definition for it).