Solve Forces & Graphs Physics Problem | RCXD Acceleration

In summary, the conversation discusses a problem with a physics test on forces and graphs, as the teacher is not able to explain the formulas clearly leading to poor grades. The individual asks for help understanding the problem and provides a specific example involving a car with explosives controlled by a joystick driving down a hill. Another user responds by suggesting the use of Newton's second law to solve the problem.
  • #1
Thepotatis
1
0
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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  • #2
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:
 

Related to Solve Forces & Graphs Physics Problem | RCXD Acceleration

1. What is the formula for calculating force?

The formula for calculating force is force = mass x acceleration. This is known as Newton's second law of motion and is represented by the equation F = ma.

2. How do you draw a free body diagram for a force problem?

To draw a free body diagram for a force problem, you must first identify all the forces acting on the object. Then, draw a dot to represent the object and draw arrows to represent the magnitude and direction of each force. Finally, label each force and make sure the arrow lengths are proportional to the magnitude of the force.

3. What is the difference between balanced and unbalanced forces?

Balanced forces are forces that are equal in size and opposite in direction, resulting in a net force of 0. This means that the object remains at rest or continues moving at a constant velocity. Unbalanced forces, on the other hand, result in a net force that is not equal to 0. This causes the object to either accelerate or decelerate.

4. How do you calculate acceleration from a force vs. time graph?

To calculate acceleration from a force vs. time graph, you can use the slope of the line. The slope represents the change in force over the change in time, which is equal to the mass times the acceleration (F = ma). Therefore, the slope of the line is equal to the acceleration.

5. How do you use the RCXD method to solve a force and acceleration problem?

The RCXD method is a problem-solving strategy for force and acceleration problems. The steps are as follows: Read the problem and identify what is given and what is asked, Choose an appropriate formula to use, Xecute the calculation using the given values, and Double check your answer and make sure it is reasonable. This method ensures that you have a clear understanding of the problem and that you use the correct formula to solve it.

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