Solve Forces & Graphs Physics Problem | RCXD Acceleration

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The discussion centers on a physics problem involving an RCXD car driving down a hill at a 30° angle, with a mass of 5 kg, a driving force of 300 N, and friction of 100 N. Participants emphasize the importance of applying Newton's second law (Ftotal = ma) to solve dynamics problems effectively. The total force acting on the car includes the driving force, friction, and weight, which must be considered to find the acceleration. The initial attempt at a solution incorrectly equates forces, highlighting the need for a clearer understanding of the concepts. Overall, the thread seeks clarification on applying these physics principles to improve test performance.
Thepotatis
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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 >.<
 
Last edited:
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Welcome to PF!

Hi Thepotatis! Welcome to PF! :wink:

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

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

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