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Car approaching a moving ramp, what happens?
Posted on 4/9/14 at 9:44 am
Posted on 4/9/14 at 9:44 am
No this isn't homework, just thinking about this after the Monty Python thread.
If the car is approaching a moving ramp that is traveling just very slightly slower than the car, what happens when the car's drive wheels hit the ramp? Assuming that the cruise control is set at velocity X and the tires have perfect traction. Does the car nearly double its velocity since its tires are moving relative to the speed of the ground passing underneath and then suddenly onto a near stationary ramp, in relation to its own velocity?
Here is a super complicated drawing I made.
If the car is approaching a moving ramp that is traveling just very slightly slower than the car, what happens when the car's drive wheels hit the ramp? Assuming that the cruise control is set at velocity X and the tires have perfect traction. Does the car nearly double its velocity since its tires are moving relative to the speed of the ground passing underneath and then suddenly onto a near stationary ramp, in relation to its own velocity?
Here is a super complicated drawing I made.
12
Posted on 4/9/14 at 9:45 am to toosleaux
quote:
Does the car nearly double its velocity since its tires are moving relative to the speed of the ground passing underneath and then suddenly onto a near stationary ramp, in relation to its own velocity?
The car would need a bazillion horsepower
Posted on 4/9/14 at 9:46 am to toosleaux
The car will remain going the same speed as it was in reference to the surface in contact but will travel at nearly twice its speed in reference to the road
ETA: but there is no way for this to happen realistically due to the frictions and sich
ETA: but there is no way for this to happen realistically due to the frictions and sich
This post was edited on 4/9/14 at 9:47 am
Posted on 4/9/14 at 9:46 am to toosleaux
The car has certain momentum that would need to change. So it wouldn't instantly double in speed.
Posted on 4/9/14 at 9:47 am to toosleaux
quote:
Assuming that the cruise control is set at velocity X and the tires have perfect traction
if it is 4 wheel drive, the car will be ripped in half.
Posted on 4/9/14 at 9:47 am to mylsuhat
quote:
The car will remain going the same speed as it was in reference to the surface in contact but will travel at nearly twice its speed in reference to the road
Like when you walk on a moving walkway at the airport
Posted on 4/9/14 at 9:48 am to toosleaux
Assuming perfect traction, I would think it would gain a significant amount of speed relative to the ground. Would be interesting to test out.
Posted on 4/9/14 at 9:49 am to Kadjin
What actually happens is the same as trying to accelerate from 1 m/s in whatever gear the car is in. Mythbusters did it.
Posted on 4/9/14 at 9:51 am to DownshiftAndFloorIt
quote:Yeah I kinda thought that would be a thing too
What actually happens is the same as trying to accelerate from 1 m/s in whatever gear the car is in. Mythbusters did it.
Posted on 4/9/14 at 9:51 am to LNCHBOX
quote:
Assuming perfect traction, I would think it would gain a significant amount of speed relative to the ground
If the drive wheel kept going whatever speed it's going and there's perfect traction, the car would be going X+(X-1) m/s relative to the ground when it hit the ramp.
Posted on 4/9/14 at 9:52 am to toosleaux
Tried to actually think about this...
Posted on 4/9/14 at 9:53 am to LNCHBOX
Similar concept, but they did this on MythBusters about Knight Rider.
LINK
LINK
quote:
When the truck is moving, the main difficulty of course is the speed difference between the truck's ramp and the road. The Mythbusters, once again, have shown that this is possible, even demonstrating the trope with a car and a truck. SCIENCE! This is due to the fact that while there is indeed a big difference to the speeding tires from the transition of passing road to static truck, the car's overall inertia is enough to overcome this and decelerates the tires. In this case, only the speed of the overall mass of the car matters, relative to the truck; the wheel speed is irrelevant.
Posted on 4/9/14 at 9:54 am to DownshiftAndFloorIt
That makes sense. And thinking about, it's like in the movies where a car drives up a ramp into the back of a semi trailer or something like that. The momentum of the car negates any traction the tires could provide because there isn't enough power to double the speed instantaneously. I feel like I may be overthinking this.
Posted on 4/9/14 at 9:55 am to LNCHBOX
quote:
The momentum of the car negates any traction the tires could provide because there isn't enough power to double the speed instantaneously. I feel like I may be overthinking this.
Nope. Nailed it.
Posted on 4/9/14 at 9:55 am to LNCHBOX
If its 4 wheel drive, the back tires probably start smoking. Assuming the frame is stronger than the force to start ripping rubber off of the tires.
If it's rear wheel drive, the car goes the same speed as before touching the ramp.
If it's rear wheel drive, the car goes the same speed as before touching the ramp.
Posted on 4/9/14 at 9:56 am to toosleaux
quote:
Does the car nearly double its velocity since its tires are moving relative to the speed of the ground passing underneath and then suddenly onto a near stationary ramp, in relation to its own velocity?
In relation to its own velocity, it would stay the same. If it's going 60mph on the speedometer, it would stay there, I think.
It would be nearly double the velocity relative to the ground. If it's going 60 and the ramp is moving 59, then it would be going 119 relative to the road.
Posted on 4/9/14 at 9:56 am to toosleaux
have you ever seen the dukes of hazzard?
Posted on 4/9/14 at 9:58 am to toosleaux
Not that tough to do IRL.
Buddy Joe Hooker or one of old guys coulda done it.
Buddy Joe Hooker or one of old guys coulda done it.
Posted on 4/9/14 at 9:58 am to toosleaux
Posted on 4/9/14 at 9:59 am to LSUBoo
quote:
In relation to its own velocity, it would stay the same. If it's going 60mph on the speedometer, it would stay there, I think.
The speedometer will actually get very close to zero. The car will be going the speed of the ramp.
Remember that relative to the ramp, it's only going 1 m/s. It would have to instantly accelerate to 60mph relative to the ramp to double it's speed relative to the ground. Aint happening.
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