How Do You Calculate the Friction Needed to Stop a Sliding Box?

AI Thread Summary
To calculate the friction needed to stop a 95-kg box sliding at 15 m/s over 15 m, the initial velocity (vi) and final velocity (vf) are used in the equation vf^2 = vi^2 + 2ad to find acceleration. Setting vf to 0 allows for the calculation of negative acceleration required to stop the box. Once acceleration is determined, the force can be calculated using F = ma, where m is the mass of the box. The coefficient of friction can then be derived from the frictional force and the normal force. Understanding these steps is crucial for solving the problem effectively.
katem
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Homework Statement


A 95-kg box is sliding along a level floor with a vi of 15m/s.

a) how large of a constant frictional force is needed to stop to box in a distance of 15m?
b)What is the coefficent of friction between the box and the floor.

Homework Equations



I tried to use vf^2=vi^2+2ad.

The Attempt at a Solution


i used the above equation and i found the acceleration by putting vf as 0 but i am stuck.
 
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If you can find the acceleration, why can't you find the force needed to produce that acceleration? F=ma.
 

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