Follow along with the video below to see how to install our site as a web app on your home screen.
Note: This feature may not be available in some browsers.
On Sunday, April 23, 2023 at 9:01:07â¯PM UTC+10, Fred Bloggs wrote:
So a vehicle is driving down the road when an entire wheel comes off and continues its direction unchanged rolling alongside the vehicle. Question is why does the wheel end up accelerating, rolling much faster than its original speed, outpacing the vehicle significantly? Answer should be obvious, but you need practical insight.
The only thing that could accelerate it would be the airflow around the vehicle body, which would be associated with trailing vortices.
It seems unlikely than any of them could make the wheel rotate much faster than it\'s original speed - it would outrun the car and the trailing vortices - unless it was moving sideways with respect to the rest of the car, and out into the wake.
--
Bill Sloman, Sydney
On Sunday, April 23, 2023 at 7:49:24â¯AM UTC-4, Anthony William Sloman
wrote:
On Sunday, April 23, 2023 at 9:01:07â¯PM UTC+10, Fred Bloggs wrote:
So a vehicle is driving down the road when an entire wheel comes
off and continues its direction unchanged rolling alongside the
vehicle. Question is why does the wheel end up accelerating,
rolling much faster than its original speed, outpacing the
vehicle significantly? Answer should be obvious, but you need
practical insight.
The only thing that could accelerate it would be the airflow around
the vehicle body, which would be associated with trailing
vortices.
It seems unlikely than any of them could make the wheel rotate much
faster than it\'s original speed - it would outrun the car and the
trailing vortices - unless it was moving sideways with respect to
the rest of the car, and out into the wake.
Alright, you\'re getting close. From what I\'ve personally observed, a
wheel dropping off the vehicle leaves the vehicle behind in the dust,
it really takes off.
On Sunday, April 23, 2023 at 9:01:07â¯PM UTC+10, Fred Bloggs wrote:
So a vehicle is driving down the road when an entire wheel comes off and continues its direction unchanged rolling alongside the vehicle. Question is why does the wheel end up accelerating, rolling much faster than its original speed, outpacing the vehicle significantly? Answer should be obvious, but you need practical insight.
The only thing that could accelerate it would be the airflow around the vehicle body, which would be associated with trailing vortices.
On Sunday, 23 April 2023 at 12:49:24 UTC+1, Anthony William Sloman wrote:
On Sunday, April 23, 2023 at 9:01:07â¯PM UTC+10, Fred Bloggs wrote:
So a vehicle is driving down the road when an entire wheel comes off and continues its direction unchanged rolling alongside the vehicle. Question is why does the wheel end up accelerating, rolling much faster than its original speed, outpacing the vehicle significantly? Answer should be obvious, but you need practical insight.
The only thing that could accelerate it would be the airflow around the vehicle body, which would be associated with trailing vortices.
a hill, obviously
The only thing that could accelerate it would be the airflow around the vehicle body, which would be associated with trailing vortices.
It seems unlikely than any of them could make the wheel rotate much faster than it\'s original speed - it would outrun the car and the trailing vortices - unless it was moving sideways with respect to the rest of the car, and out into the wake.
On Sunday, April 23, 2023 at 7:01:07â¯AM UTC-4, Fred Bloggs wrote:
So a vehicle is driving down the road when an entire wheel comes off and continues its direction unchanged rolling alongside the vehicle. Question is why does the wheel end up accelerating, rolling much faster than its original speed, outpacing the vehicle significantly? Answer should be obvious, but you need practical insight.
The vehicle\'s speed is controlled by the motor. It can provide both force to accelerate and drag to slow. You don\'t say anything about which is happening in this case, if either.
Someone has pointed out that the wheel\'s diameter is now larger. That would tap the rotational inertia, turning it into linear velocity, but it won\'t be a large amount, certainly single digit percent, since the size difference is on that scale. That doesn\'t sound like \"much faster\".
On 2023/04/23 4:01 a.m., Fred Bloggs wrote:
So a vehicle is driving down the road when an entire wheel comes off and continues its direction unchanged rolling alongside the vehicle. Question is why does the wheel end up accelerating, rolling much faster than its original speed, outpacing the vehicle significantly? Answer should be obvious, but you need practical insight.
The wheel can\'t accelerate without an external force being added to it -
it has no means of self propulsion. Laws of the conservation of momentum
apply as usual.
On 23/04/2023 13:44, Fred Bloggs wrote:
On Sunday, April 23, 2023 at 7:49:24â¯AM UTC-4, Anthony William Sloman
wrote:
On Sunday, April 23, 2023 at 9:01:07â¯PM UTC+10, Fred Bloggs wrote:
So a vehicle is driving down the road when an entire wheel comes
off and continues its direction unchanged rolling alongside the
vehicle. Question is why does the wheel end up accelerating,
rolling much faster than its original speed, outpacing the
vehicle significantly? Answer should be obvious, but you need
practical insight.
The only thing that could accelerate it would be the airflow around
the vehicle body, which would be associated with trailing
vortices.
It seems unlikely than any of them could make the wheel rotate much
faster than it\'s original speed - it would outrun the car and the
trailing vortices - unless it was moving sideways with respect to
the rest of the car, and out into the wake.
Alright, you\'re getting close. From what I\'ve personally observed, a
wheel dropping off the vehicle leaves the vehicle behind in the dust,
it really takes off.
Its diameter changes quite radically when it is no longer being squashed
by the weight of the car and so although it was previously rolling with
constant velocity at radius r when loaded the sudden loss of load means
the tyre expands to about 10-15% larger radius R ~ 1.1r where it is in
contact with the road. The car may also slow down with one wheel missing
if the driver has any road sense at all.
Angular momentum is conserved in the short term so the wheel now has a
linear velocity increase by about 10-15% compared to the car.
BTW Wheels shouldn\'t drop off properly maintained vehicles.
I only know of one hapless individual with no engineering or mechanical
sense at all who was actually passed by one of their own wheels.
On Sunday, April 23, 2023 at 7:49:24â¯AM UTC-4, Anthony William Sloman wrote:
On Sunday, April 23, 2023 at 9:01:07â¯PM UTC+10, Fred Bloggs wrote:
So a vehicle is driving down the road when an entire wheel comes off and continues its direction unchanged rolling alongside the vehicle. Question is why does the wheel end up accelerating, rolling much faster than its original speed, outpacing the vehicle significantly? Answer should be obvious, but you need practical insight.
The only thing that could accelerate it would be the airflow around the vehicle body, which would be associated with trailing vortices.
It seems unlikely than any of them could make the wheel rotate much faster than it\'s original speed - it would outrun the car and the trailing vortices - unless it was moving sideways with respect to the rest of the car, and out into the wake.
Alright, you\'re getting close. From what I\'ve personally observed, a wheel dropping off the vehicle leaves the vehicle behind in the dust, it really takes off.
On 2023/04/23 4:01 a.m., Fred Bloggs wrote:
So a vehicle is driving down the road when an entire wheel comes off
and continues its direction unchanged rolling alongside the vehicle.
Question is why does the wheel end up accelerating, rolling much
faster than its original speed, outpacing the vehicle significantly?
Answer should be obvious, but you need practical insight.
The wheel can\'t accelerate without an external force being added to it -
it has no means of self propulsion. Laws of the conservation of momentum
apply as usual.
Rather the vehicle the wheel left has started to decelerate due to
increased drag on the other three axles and as the vehicle side missing
a wheel drops to the pavement.
John :-#)#
On 4/23/2023 9:39 AM, Martin Brown wrote:
On 23/04/2023 13:44, Fred Bloggs wrote:
On Sunday, April 23, 2023 at 7:49:24â¯AM UTC-4, Anthony William Sloman
wrote:
On Sunday, April 23, 2023 at 9:01:07â¯PM UTC+10, Fred Bloggs wrote:
So a vehicle is driving down the road when an entire wheel comes
off and continues its direction unchanged rolling alongside the
vehicle. Question is why does the wheel end up accelerating,
rolling much faster than its original speed, outpacing the
vehicle significantly? Answer should be obvious, but you need
practical insight.
The only thing that could accelerate it would be the airflow around
the vehicle body, which would be associated with trailing
vortices.
It seems unlikely than any of them could make the wheel rotate much
faster than it\'s original speed - it would outrun the car and the
trailing vortices - unless it was moving sideways with respect to
the rest of the car, and out into the wake.
Alright, you\'re getting close. From what I\'ve personally observed, a
wheel dropping off the vehicle leaves the vehicle behind in the dust,
it really takes off.
Its diameter changes quite radically when it is no longer being squashed
by the weight of the car and so although it was previously rolling with
constant velocity at radius r when loaded the sudden loss of load means
the tyre expands to about 10-15% larger radius R ~ 1.1r where it is in
contact with the road. The car may also slow down with one wheel missing
if the driver has any road sense at all.
Angular momentum is conserved in the short term so the wheel now has a
linear velocity increase by about 10-15% compared to the car.
BTW Wheels shouldn\'t drop off properly maintained vehicles.
https://www.youtube.com/shorts/3-wk1CYv8JY
https://www.drivingline.com/articles/wheel-spacer-facts-what-to-know-before-you-buy/
I only know of one hapless individual with no engineering or mechanical
sense at all who was actually passed by one of their own wheels.
Doesn\'t look like this wheel \"outpaced\" the vehicle it came off of, it
kept pace rather nicely right into oncoming traffic. (all occupants
survived with minor injuries)
On 23/04/2023 13:44, Fred Bloggs wrote:
On Sunday, April 23, 2023 at 7:49:24â¯AM UTC-4, Anthony William Sloman
wrote:
On Sunday, April 23, 2023 at 9:01:07â¯PM UTC+10, Fred Bloggs wrote:
So a vehicle is driving down the road when an entire wheel comes
off and continues its direction unchanged rolling alongside the
vehicle. Question is why does the wheel end up accelerating,
rolling much faster than its original speed, outpacing the
vehicle significantly? Answer should be obvious, but you need
practical insight.
The only thing that could accelerate it would be the airflow around
the vehicle body, which would be associated with trailing
vortices.
It seems unlikely than any of them could make the wheel rotate much
faster than it\'s original speed - it would outrun the car and the
trailing vortices - unless it was moving sideways with respect to
the rest of the car, and out into the wake.
Alright, you\'re getting close. From what I\'ve personally observed, a
wheel dropping off the vehicle leaves the vehicle behind in the dust,
it really takes off.
Its diameter changes quite radically when it is no longer being squashed
by the weight of the car and so although it was previously rolling with
constant velocity at radius r when loaded the sudden loss of load means
the tyre expands to about 10-15% larger radius R ~ 1.1r where it is in
contact with the road. The car may also slow down with one wheel missing
if the driver has any road sense at all.
Angular momentum is conserved in the short term so the wheel now has a
linear velocity increase by about 10-15% compared to the car.
BTW Wheels shouldn\'t drop off properly maintained vehicles.
I only know of one hapless individual with no engineering or mechanical
sense at all who was actually passed by one of their own wheels.
--
Martin Brown
On 2023/04/23 4:01 a.m., Fred Bloggs wrote:
So a vehicle is driving down the road when an entire wheel comes off and continues its direction unchanged rolling alongside the vehicle. Question is why does the wheel end up accelerating, rolling much faster than its original speed, outpacing the vehicle significantly? Answer should be obvious, but you need practical insight.
The wheel can\'t accelerate without an external force being added to it -
it has no means of self propulsion. Laws of the conservation of momentum
apply as usual.
Rather the vehicle the wheel left has started to decelerate due to
increased drag on the other three axles and as the vehicle side missing
a wheel drops to the pavement.
John :-#)#
On Sunday, April 23, 2023 at 1:03:04?PM UTC-4, John Robertson wrote:
On 2023/04/23 4:01 a.m., Fred Bloggs wrote:
So a vehicle is driving down the road when an entire wheel comes off and continues its direction unchanged rolling alongside the vehicle. Question is why does the wheel end up accelerating, rolling much faster than its original speed, outpacing the vehicle significantly? Answer should be obvious, but you need practical insight.
The wheel can\'t accelerate without an external force being added to it -
it has no means of self propulsion. Laws of the conservation of momentum
apply as usual.
Think of a figure skater doing one of those stationary spins. Arms outstretched is one spin rate, arms brought into the side and they turn into a blur. No external forces come into play.
On 4/23/2023 8:44 AM, Fred Bloggs wrote:
On Sunday, April 23, 2023 at 7:49:24?AM UTC-4, Anthony William Sloman wrote:
On Sunday, April 23, 2023 at 9:01:07?PM UTC+10, Fred Bloggs wrote:
So a vehicle is driving down the road when an entire wheel comes off and continues its direction unchanged rolling alongside the vehicle. Question is why does the wheel end up accelerating, rolling much faster than its original speed, outpacing the vehicle significantly? Answer should be obvious, but you need practical insight.
The only thing that could accelerate it would be the airflow around the vehicle body, which would be associated with trailing vortices.
It seems unlikely than any of them could make the wheel rotate much faster than it\'s original speed - it would outrun the car and the trailing vortices - unless it was moving sideways with respect to the rest of the car, and out into the wake.
Alright, you\'re getting close. From what I\'ve personally observed, a wheel dropping off the vehicle leaves the vehicle behind in the dust, it really takes off.
It seems like a potentially complex process, particularly if it\'s one of
the drive wheels in a modern car with traction control, and/or the wheel
isn\'t in full contact with the pavement when it separates.
On Sun, 23 Apr 2023 15:30:24 -0400, bitrex <us...@example.net> wrote:
On 4/23/2023 8:44 AM, Fred Bloggs wrote:
On Sunday, April 23, 2023 at 7:49:24?AM UTC-4, Anthony William Sloman wrote:
On Sunday, April 23, 2023 at 9:01:07?PM UTC+10, Fred Bloggs wrote:
So a vehicle is driving down the road when an entire wheel comes off and continues its direction unchanged rolling alongside the vehicle. Question is why does the wheel end up accelerating, rolling much faster than its original speed, outpacing the vehicle significantly? Answer should be obvious, but you need practical insight.
The only thing that could accelerate it would be the airflow around the vehicle body, which would be associated with trailing vortices.
It seems unlikely than any of them could make the wheel rotate much faster than it\'s original speed - it would outrun the car and the trailing vortices - unless it was moving sideways with respect to the rest of the car, and out into the wake.
Alright, you\'re getting close. From what I\'ve personally observed, a wheel dropping off the vehicle leaves the vehicle behind in the dust, it really takes off.
It seems like a potentially complex process, particularly if it\'s one of
the drive wheels in a modern car with traction control, and/or the wheel
isn\'t in full contact with the pavement when it separates.
If it bounces up before it breaks off, the differential (assume it has
one) could spin it way up.