# Recent content by Butterfly30

1. ### Frictional force on a car on an inclined plane

Oh, but do u enter my (a) as negative since the car is slowing down?
2. ### Frictional force on a car on an inclined plane

A 2319kg car is moving down a road with a slope grade of 11% and slowing down at a rate of 3.8m/s^2.Find the direction and magnitude of the frictional force ( define positive in the forward direction ie down the slope) So the equation I have is f= ma+ mgsinθ. For my angle I get...
3. ### Find frictional force given acceleration, grade, and mass

So basically given this problem: a 1892kg car is moving down a road with slope (grade) of 12% while slowing down at a rate of 3.7m/s^2 .What is the direction and magnitude of the frictional force?(define positive in the forward direction) Would my force be the tangent of the angle 12...
4. ### Find frictional force given acceleration, grade, and mass

Sorry these were the numbers, I accidently mixed two probs together:/ a 1892kg car is moving down a road with slope (grade) of 12% while slowing down at a rate of 3.7m/s^2 .What is the direction and magnitude of the frictional force?(define positive in the forward direction) Using...
5. ### Find frictional force given acceleration, grade, and mass

a 1000 kg car is moving down a road with slope (grade) of 15% while slowing down at a rate of 3.7m/s^2 .What is the direction and magnitude of the frictional force?(define positive in the forward direction) Using f=ma I have the mass 1000 kg, the acceleration 3.7m/s^2, and slope 15%...
6. ### Fictional force problem given a slope(grade)?

Would it be equal to the mass?
7. ### Fictional force problem given a slope(grade)?

Zero? The frictional force would be zero. So, then the grade (the incline) was given just to make us think and try to picture it, I guess. Ok, how about if we're given the grade and told that the the car was speeding up at 3m/s^2 I know the mass (1000kg) and I think theta would be the...
8. ### Fictional force problem given a slope(grade)?

fictional force problem....given a slope(grade)??? A 1000kg car is moving down a road with a slope(grade) of 15% at a constant speed of 15m/s. What is the direction and magnitude of the frictional force? So... V= 15m/s a= 0 (constant) The slope really throws me off..I don't know...
9. ### Confused kinematics equations & ball motion in the air

Yay, actually I got it! Thanks sobmuch!
10. ### Confused kinematics equations & ball motion in the air

Yes this is what I had, but I mentioned the #'s changed when i entered my answer so 7.25 became 5.16. It is late, thank you for your help... I wouldn't have gotten this far so thank u and good night :)
11. ### Confused kinematics equations & ball motion in the air

Ok, the #'s change each time but same question so, given y0=4ft(1.21m) v0y=5.16m/s v0x=2.41. Quad eqtn 1.21+5.16t+(-4.91)t^2 End up with -5.16+-sqrt50.3/2(-4.9) T=1.25. So when I plug this into the x eqtn x=v0t. X=2.41•1.25. X= 3.01m I dont know I this is right, once I enter it...
12. ### Confused kinematics equations & ball motion in the air

Hmmm... I'm still getting it wrong. When I put into the quadratic it's 1.21m + 7.25 t + -4.9t2. Btw it's 1.21m from the 4ft given... I get a time that is a decimal so when I put it into the x eqtn it's very low.... I'm stuck
13. ### Confused kinematics equations & ball motion in the air

So the quadratic eqtn would give me the time it would take .... So I would then have to plug this into the eqtn x=x0+v0t+1/2at^2 but it would become x=x0+v0t since a for x equals zero... Right?
14. ### Confused kinematics equations & ball motion in the air

Oops yes it is thrown from a height of 4ft. So Would I still make my y and y0 = 0 and them handle the 4 ft afterwards?
15. ### Confused kinematics equations & ball motion in the air

I'm still confused...if I try to solve for t what is my change in y? It says 4ft from the ground....but what about what it travels when it's is thrown up? Also wouldn't I have to make a= 9.81?