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| Thread ID: 88253 | 2008-03-21 01:01:00 | Physics Question... | John W (523) | PC World Chat |
| Post ID | Timestamp | Content | User | ||
| 651246 | 2008-03-25 10:24:00 | which example? that race with the dip is a completely different scenario. Au contraire - it is just another variation on the Brachistochrone problem. Given there is a solution to that problem and such a curve exists (i.e. there is such a thing as a fastest curve, which is not straight incline) then the results will not be identical. That example shows the exit speed for the two tracks is the same and given momentum = mass x velocity, then the 2 balls will travel the same distance after exiting the ramp given they have the same mass and same velocity at the point of exiting the ramp. However, the ball that took the longer path will reach the end-point first due to a higher average velocity, which means taking the shortest route won't necessarily get something somewhere the fastest. What has this got to do with Burt Monroe? If time is not a constraint, which it isn't in a land speed test, then you don't need to get off the mark as fast possible - a smoother acceleration gets the same result probably with less fuel expended and less strain on the motorcycle. From memory he took an age to get to the speeds he did during each test and I'm guessing he used a smooth acceleration technique.......and this principle to justify the 'slowly slowly catch a monkey' approach to speed tests? Andrew :cool: |
andrew93 (249) | ||
| 651247 | 2008-03-26 11:04:00 | What has this got to do with Burt Monroe? If time is not a constraint, which it isn't in a land speed test, then you don't need to get off the mark as fast possible - a smoother acceleration gets the same result probably with less fuel expended and less strain on the motorcycle. From memory he took an age to get to the speeds he did during each test and I'm guessing he used a smooth acceleration technique.......and this principle to justify the 'slowly slowly catch a monkey' approach to speed tests? that might have alot more to do with transmission gearing; with a maximum limit of the number of gears available, they would all have to be as "tall" as possible to reach the maximum speed the engine is capable of maintaining, without stalling the engine on the way up to that speed as consequence of torque/power characteristics of the engine |
motorbyclist (188) | ||
| 651248 | 2008-03-26 15:28:00 | One of the items that caught my eye was an explanation of which ball would roll the furtherest from the two optioins given . 1 - A ball droped down a straight incline with a flat smooth roll out area . 2 - A ball dropped down a curved ramp with the identical a flat roll out area . Both balls are the same size, weight and the vertical drop was the same . Roll out area was infinite in length . The horizontal distance between the start location and the bottom of the incline was the same as the curve terminated to a smooth flat roll out area . They gave the answer, but Ive forgotten as well as its explanation . Your thoughts please . The answer is moot . What is the ball's motive? I think they are asexual, so that leaves Freud out of the equation . |
SurferJoe46 (51) | ||
| 651249 | 2008-03-26 18:29:00 | And we are still talking about the balls? | R2x1 (4628) | ||
| 651250 | 2008-03-27 05:35:00 | that might have alot more to do with transmission gearing; with a maximum limit of the number of gears available, they would all have to be as "tall" as possible to reach the maximum speed the engine is capable of maintaining, without stalling the engine on the way up to that speed as consequence of torque/power characteristics of the engine That's the idea. When I was referring to 'acceleration', it was the physics definition of acceleration, i.e. the rate of change of velocity. Taller gears would do exactly that. Did you see the movie? In particular the scene on the beach, and the way he conducted his land speed tests, suggests he may have done exactly that. |
andrew93 (249) | ||
| 651251 | 2008-03-27 12:29:00 | That's the idea. When I was referring to 'acceleration', it was the physics definition of acceleration, i.e. the rate of change of velocity. Taller gears would do exactly that. Did you see the movie? In particular the scene on the beach, and the way he conducted his land speed tests, suggests he may have done exactly that. yes i saw the movie gearing on internal combustion engines has very little bearing on the ball scenario |
motorbyclist (188) | ||
| 651252 | 2008-03-28 03:35:00 | Just like "that race with the dip is a completely different scenario"? | andrew93 (249) | ||
| 651253 | 2008-03-29 02:22:00 | well it is! well not completely they both show that having a higher velocity has the capacity to make the longer distance the faster one. no surprises there. but they are both different means of showing it, so applying the maths form the "slow/short vs fast/long" isn't going to help with this "straight ramp vs curved ramp" example |
motorbyclist (188) | ||
| 651254 | 2008-03-29 03:37:00 | You should visit the Otago museum and tell them they have made a mistake, and they need to remove the exhibit...... :rolleyes: | andrew93 (249) | ||
| 651255 | 2008-03-29 04:00:00 | now why would i do that? i don't even know what their answer to the problem is, nor have i bothered to find it myself seeing as i don't know what we are to consider/ignore. |
motorbyclist (188) | ||
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