Solve Forces & Graphs Physics Problem | RCXD Acceleration

[Thepotatis]

So the problem is that i have a physics test coming up and its about forces and graphs.
The teacher can not explain the different formulas clearly which results in everyone getting bad grades. I wonder if anyone can explain this to me.

Homework Equations

A RCXD (a little car with explosives controlled by a joystick) drives down a hill with an angle of 30°. Its mass = 5kg. What is its acceleration if the driving force ( force motrice in french) = 300[N] and the friction = 100[N]?

The Attempt at a Solution

FM (driving force) -f (friction) = 0 ?
300-200 = 0 -> 100 = 0 so not possible >.<

 

[tiny-tim]

Welcome to PF!

Hi Thepotatis! Welcome to PF!

Nearly all dynamics questions are solved by applying good ol' Newton's second law (F_total = ma), in one or more directions …

in this case, there are at least three forces making up F_total: the driving force, the friction, and the weight