HElp wiht homework please ??? Science finding the force of friction ??

Question

THE PROBLEM IS : You push a 2-kg book with a force of 5 N. Find the force of sliding friction on the book if it has an acceleration of 1.0 m/s2.

Answer 1

The force of sliding friction, mu-s, is found through the formula Ff = mu-s * Fn, where Ff is the force of friction and Fn is the normal force. Ff works against your force that moves an object. In this case, you have a force acting to move a book, 5 N, and a force of friction Ff countering that. Using a force equation (F = ma), we have this:

Fp - Ff = ma
5 N - Ff = (2 kg)(1 m/s^2)
Ff = 3 N

Now, since Ff is 3 N, we can find mu-s:

Ff = mu-s * Fn
3 N = mu-s * (2 kg)(9.81 m/s^2)
3 N = mu-s * 19.62 N
mu-s = 0.153