Timeline for Accelerating onto and over inclined plane
Current License: CC BY-SA 3.0
13 events
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| Dec 7, 2013 at 20:34 | history | edited | Brandon Enright | CC BY-SA 3.0 |
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| Aug 9, 2013 at 17:29 | comment | added | user80551 | 2. The work is not identical. $W=F\cdot s$ and $s$ is changing. | |
| Jul 11, 2013 at 14:09 | history | tweeted | twitter.com/#!/StackPhysics/status/355328112675917824 | ||
| Mar 12, 2013 at 22:55 | comment | added | Wouter | Something else to consider is the mass distribution, though that might be alright in the case of hobbyist RC cars. @ja72 also touches on an important point: the transition from a flat to an inclined plane should be smooth for minimal energy loss and optimal control (reproducibility). | |
| Mar 12, 2013 at 14:13 | answer | added | Phil H | timeline score: 1 | |
| Mar 12, 2013 at 13:25 | comment | added | John Alexiou | IF the launch angle is to be 45° that does not mean the ramp has to be the same also. Considering the suspension and tires the ramp shape, the transition and well as the speed affect the launch angle. Think also of the speed lost transitioning from flat to the ramp. | |
| Mar 12, 2013 at 12:15 | history | edited | Robert Graves | CC BY-SA 3.0 |
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| Mar 12, 2013 at 12:11 | comment | added | Robert Graves | After doing a bit of testing using a trajectory calculator which takes into account an initial height (had2know.com/academics/…), the optimal angle would be closer to 43 degrees. However this still doesn't account for the poor performance of the 45 degree angle jump. Next week we'll run the full tests and we'll post the results. | |
| Mar 12, 2013 at 11:41 | comment | added | Robert Graves | The track is straight. The jumps are 12 inches high. The 45 degree jump is 17 inches long. I taught him some basic trig to calculate the length using the angle and the height to find the hypotenuse. The landing is back at ground level, so your point is valid. You'd be surprised how far these RC cars can jump. At full speed of approximately 30 mph, it can go quite far. However we had to drop the speed considerably to eliminate the car bottoming out on the 45 degree jump. | |
| Mar 12, 2013 at 4:23 | comment | added | krs013 | Also, if the jumps are higher than the plane your car will be landing on, 45° isn't necessarily optimal. You would have to calculate that more specifically. In any case, I wouldn't expect RC cars going off of jumps to go very far. | |
| Mar 12, 2013 at 4:15 | comment | added | krs013 | How long and high is the jump? Is it a small jump at the end of the track, or a large curved one? Like you say, a lot of the energy could be lost in the climb, but if it's a 12-inch jump after a 20-foot acceleration, then 45° is probably your best best. | |
| Mar 11, 2013 at 20:26 | review | First posts | |||
| Mar 11, 2013 at 21:12 | |||||
| Mar 11, 2013 at 20:10 | history | asked | Robert Graves | CC BY-SA 3.0 |