coefficient of friction Watch

santeria133
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Report Thread starter 5 years ago
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I'm stuck on a question in which we are given three values: mu= 0.3

initial velocity = 7m/s and that it travels 2m . The question asks me to find the speed at the end of the 2m . I havent really got my head around friction yet and was wondering if anyone could point me in the right direction for this?

ive understood the normal force = 9.8 m and that the max friction force is 0.3 x9.8m but dont see how either of these would help?
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Stonebridge
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(Original post by santeria133)
I'm stuck on a question in which we are given three values: mu= 0.3

initial velocity = 7m/s and that it travels 2m . The question asks me to find the speed at the end of the 2m . I havent really got my head around friction yet and was wondering if anyone could point me in the right direction for this?

ive understood the normal force = 9.8 m and that the max friction force is 0.3 x9.8m but dont see how either of these would help?
You just have to apply the formula F=ma to get the deceleration of the mass where F is the expression you have written. m cancels.

When you have a, you can apply a suvat equation to find v, given u, s and a here.
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