# Coefficient kinetic friction and kinetic friction

1. ### IssacChook

2
Hi guys, i have some questions regarding Frictional Force that came up in a book.
If the cube moves throgh a distance of 4.0m in 2.0s, find the kinetic friction and coefficient kinetic friction between the cube and the plane. ( coefficient of static friction force Us= 0.466, angle of incline= 25) , how to solve it? Thanks

2. ### Chronos

9,758
It wouldn't hurt to know the mass of the cube.

3. ### IssacChook

2
Sorry, missed out something

the mass of the block is 3.okg

4. ### Delta²

461
You can calculate the acceleration a of the block by using the formula $$s=(1/2)at^2$$ where s=4.0m, t=2.0s. Then you should calculate all the forces acting on the x-axis (axis parallel to the incline) which are the kinetic friction T and component of weight on the x-axis $$B_x$$. It will be $$B_x-T=ma$$ where m the mass of block and a the acceleration you calculated on first step. From the last equation you ll be able to find the coefficient and the kinetic friction T.