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Originally Posted by Tog_
...the car will overtake the trailer at 3 units per hour, but as soon as the car hits the trailer the tires will be going 33 relative to the trailer, and thus accelerate to 63 relative to the ground, assuming the driver does not back off of the throttle. Is this right?
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When the car hits the ramp, the wheels may be going 60 mph relative to the trailer, but the car is only going 3 mph relative to the trailer. The wheels rapidly decelerate, while imparting a slight acceleration to the car, perhaps 1 mph.
However, the latter is quick absorbed by the fact that the car is going up a ramp. In practice, the driver must mash down on the accelerator to move up the ramp. For cars with automatic transmissions, it's a bit of a shock, and for manuals, the driver essentially overtakes the other vehicle around 10+ mph, mashing the clutch a split-second before the drive wheels contact the ramp, then rapidly shifting into first for the trip up the ramp.
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In the same line, what if a remote controlled plane were flown into the open back of a box trailer?
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The moment it reached the mass of air moving along with the trailer, it would lose lift and dive to the floor of the trailer, probably breaking a prop in the process.
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I've always figured that the plane would have a sudden acceleration...
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You're right, as the zero drag and maximum bite of the prop would result in it rapidly accelerating forward compared to the ground.
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...but as I think about it now, I think the plane would drop to the floor of the trailer since the airspeed would drop from 60 kph to 10.
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That too! Both factors would be at work.
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At least until it got back up to speed or hit the front of the box.
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Precisely - if it got back up to speed rapidly enough, it could recover and fly through the box. Until it goes BLOOEY! when it hits the front end.
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Originally Posted by JohnD
IfUnless you saw the original '69 Italian Job, this will be nonsense. If you did, it's brilliant but hallucinatory.
Happy Christmas
John
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That's awesome! Exceptionally well done.
Here's what the original looked like.