| Thread Closed |
kinematics: force along x-axis problem |
Share Thread | Thread Tools |
| Oct12-04, 08:13 PM | #1 |
|
|
kinematics: force along x-axis problem
The only force acting on a 2.7 kg body as it moves along the positive x axis has an x component Fx = - 6x N, where x is in meters. The velocity of the body at x = 3.0 m is 8.0 m/s.
What is the velocity at x = 4? I found it to be 0.22m/s but my friends swear up and down it's not. Could I get a second opinion on this answer? My work is something like this: F = -6x a = -6/2.7 * x v = -3/2.7 * x^2 +c v(3) = 8 8 = -3/2.7 * 3^2 + c c = 18 v(4) = -3/2.7 * 4^2 + 18 v(4) = 0.222 Corrections please? Thanks in advance. |
| Oct12-04, 08:58 PM | #2 |
|
|
W = d(Kinetic energy) = (Integral from inital to final ) F dx
that's waht you're missing |
| Oct12-04, 09:19 PM | #3 |
|
|
heh that makes sense. I had forgotten the point of the entire hw assignment I was helping with was work-related. I still can't figure out why my way didn't work though oh well.
|
| Oct12-04, 09:45 PM | #4 |
|
|
kinematics: force along x-axis problemand how did you derive v from that ??? Remember that is W is the integral because it is the area under the graph of force and the only way to do that is to find the integral |
| Thread Closed |
| Thread Tools | |
Similar Threads for: kinematics: force along x-axis problem
|
||||
| Thread | Forum | Replies | ||
| Frictional Force/Kinematics Problem | Introductory Physics Homework | 13 | ||
| Work/force/kinematics slingshot problem | Introductory Physics Homework | 3 | ||
| [SOLVED] Seriously? Moment of Force about a specified Axis | Introductory Physics Homework | 4 | ||
| angle between 2 axis of 3 force vector | General Math | 0 | ||
| Electric force between two charges on z-axis | Advanced Physics Homework | 5 | ||