Anywhere in the UK you can take your Zed to see what it will do?

[buzyg]

On the earth in air, drag ruins it all as it affects the two identical objects of differnet mass (in BMWZ4MCs example) because whilst the drag remains the same for both objects gravity is acting on the heavier version with more force..that force overides the drag for a longer period than the lighter object of the same shape..

Ok, had a further think about this, and while I appreciate now that you can't ignore air resistance if you are having a freefall Z4 race off Beachy Head (with very good timing gear ), I still don't understand the above.

Drag (force due to air resistance) remains the same for identical objects of different mass - yep
Gravity acts on the heavier version with more force - yep
That force overrides the drag for a longer period of time than for the lighter object - yes, but this only explains the higher terminal velocity, it doesn't directly explain why there are different rates of change of acceleration in the first place.

The acceleration due to gravity is the same as it would be in a vacuum (i.e. constant because mass nets out when you account for inertia). It's the effect of the drag force that causes the differing rates of change of acceleration. The force is the same for both objects but the lighter object has less inertia. Right? :?

The accelerative force due to gravity is the same, for a given point on the earth surface. The air causes drag and that reduces the rate of acceleration.

NB.. (Just out of interest. Did you know the heaviest you can weigh, any place on the UK mainland, is stood on top of High Willhays in Devon. Just please trust me on that one. It's true but it's been a long day.)

NB2.. The Z4 in the beachy head example. Should it somehow retain it's original mass after the crash. Would weigh slightly less than it did at the top of the cliff. Aren't you glad you joined the Z4 Forum now.

 

[patriot66]

Neither of us are going out in that Buzy.....not unless we want to discuss at first hand, drowning.....

That is an amazing photo. I have surfed some big waves in my time, probably the some of biggest the UK can offer. But that is in a different league all together. 8)

Nazare’ in Portugal....as mental as it gets. Even when I was swimming competively and surfing at weekends I wouldn’t have gone anywhere near that...!! You couldn’t pay me enough....no point having a few quid n your waterlogged coffin Buzy.... :lol:

"As mental as it gets" indeed. Nowt to do with physics but just incredible surfing
https://youtu.be/GJc4Ir78KdE

 

[Smartbear]

On the earth in air, drag ruins it all as it affects the two identical objects of differnet mass (in BMWZ4MCs example) because whilst the drag remains the same for both objects gravity is acting on the heavier version with more force..that force overides the drag for a longer period than the lighter object of the same shape..

Ok, had a further think about this, and while I appreciate now that you can't ignore air resistance if you are having a freefall Z4 race off Beachy Head (with very good timing gear ), I still don't understand the above.

Drag (force due to air resistance) remains the same for identical objects of different mass - yep
Gravity acts on the heavier version with more force - yep
That force overrides the drag for a longer period of time than for the lighter object - yes, but this only explains the higher terminal velocity, it doesn't directly explain why there are different rates of change of acceleration in the first place.

The acceleration due to gravity is the same as it would be in a vacuum (i.e. constant because mass nets out when you account for inertia). It's the effect of the drag force that causes the differing rates of change of acceleration. The force is the same for both objects but the lighter object has less inertia. Right? :?

The accelerative force due to gravity is the same, for a given point on the earth surface. The air causes drag and that reduces the rate of acceleration.

NB.. (Just out of interest. Did you know the heaviest you can weigh, any place on the UK mainland, is stood on top of High Willhays in Devon. Just please trust me on that one. It's true but it's been a long day.)

NB2.. The Z4 in the beachy head example. Should it somehow retain it's original mass after the crash. Would weigh slightly less than it did at the top of the cliff. Aren't you glad you joined the Z4 Forum now.

Surely the car at the bottom of the cliff would weigh slightly more, not less?
If you reversed the idea, ultimately the car leaving the earths atmosphere would weigh considerably less than the car at the bottom of the cliff due to the lessening strength of the planets gravitational force :?
Rob

 

[buzyg]

Ok, had a further think about this, and while I appreciate now that you can't ignore air resistance if you are having a freefall Z4 race off Beachy Head (with very good timing gear ), I still don't understand the above.

Drag (force due to air resistance) remains the same for identical objects of different mass - yep
Gravity acts on the heavier version with more force - yep
That force overrides the drag for a longer period of time than for the lighter object - yes, but this only explains the higher terminal velocity, it doesn't directly explain why there are different rates of change of acceleration in the first place.

The acceleration due to gravity is the same as it would be in a vacuum (i.e. constant because mass nets out when you account for inertia). It's the effect of the drag force that causes the differing rates of change of acceleration. The force is the same for both objects but the lighter object has less inertia. Right? :?

The accelerative force due to gravity is the same, for a given point on the earth surface. The air causes drag and that reduces the rate of acceleration.

NB.. (Just out of interest. Did you know the heaviest you can weigh, any place on the UK mainland, is stood on top of High Willhays in Devon. Just please trust me on that one. It's true but it's been a long day.)

NB2.. The Z4 in the beachy head example. Should it somehow retain it's original mass after the crash. Would weigh slightly less than it did at the top of the cliff. Aren't you glad you joined the Z4 Forum now.

Surely the car at the bottom of the cliff would weigh slightly more, not less?
If you reversed the idea, ultimately the car leaving the earths atmosphere would weigh considerably less than the car at the bottom of the cliff due to the lessening strength of the planets gravitational force :?
Rob

It does depend on the mass density off the cliff directly under the car and the distance from the mass centre of the earth. So either of us could be right Rob. But not for the reason you think. Just thought I would throw it in there to get the old grey matter ticking over on how gravity works. While your in contact with another body the gravity increases the greater the mass of the body. It's only once you move away from the other body mass that gravity starts to diminish. So gravity is greatest at the earth surface. Not at a set distance from the earth centre.

 

[john-e89]

Can you get me some of that body contact you talk about with this laydee Buzy mate...? :wub:

 

[Stevo1987]

Can you get me some of that body contact you talk about with this laydee Buzy mate...? :wub:

At last this thread just got interesting. Though I still don't know where to take my car for a blast.

 

[buzyg]

Can you get me some of that body contact you talk about with this laydee Buzy mate...? :wub:

At last this thread just got interesting. Though I still don't know where to take my car for a blast.

A few points I forgot too mention about gravity there.