# -Frictional force

1. Nov 12, 2007

### pinkyjoshi65

[SOLVED] URGENT---Frictional force

A force of 1.6N is applied to a box of mass 1.8Kg. It accelerates 0.6m/s^2. Determine Ff and the coefficient of kientic friction.

K so I knoe how to do this. But in the text book, it has been done in a different way.

So what I did is Found the net force using F=ma.
Then i subtract from 1.6 and get Ff.
Then use the formula mk= Ff/Fn

In the book they took Ff=ma
Which is the right solution?

2. Nov 12, 2007

### Kurdt

Staff Emeritus
Well $F_{net}=F_{applied}-F_k$ where $F_k$ is the force due to kinetic friction. So with a bit of manipulating one can see that the friction force will be the applied force minus the net force which can be worked out from the acceleration of the block.

3. Nov 12, 2007

### pinkyjoshi65

And fnet is MA

4. Nov 12, 2007

### Kurdt

Staff Emeritus
Yes.