Wind affect on going uphill and downhill question

[Dirk]

According to this bloke down the pub,if you throw a tennis ball and a brick off the top of Blackpool Tower at the same time,both will hit the ground at the same time.

Tell him to get his facts correct before making assertions.

 

[vickster]

Tell him to get his facts correct before making assertions.

I don't think facts are terribly important for a posturing pub bore

 

[raleighnut]

That's only if you drop things, if something is rolling down a slope then the heavier it is the faster it will accelerate,


View: https://youtu.be/j6Ygh0YyREA


EDIT - Towards the end of the clip they add 5Kg of weight.

 

[Jody]

Clearly that bloke doesn't have a science degree...

A GCSE in physics would be a start

 

[lazybloke]

A GCSE in physics would be a start

l was think O-level. Showing my age.


Acceleration due to gravitational force is same for all falling/descending objects. It's friction and wind resistance that make the difference, plus distance to cake stop.

 

[Ajax Bay]

Accy - try and get your head round this lot (and the links therein):
https://www.cyclingpowerlab.com/Concepts.aspx
I wonder whether: a brick, a feather, a tennis ball, a pub bore - reach terminal velocity if thrown off the Blackpool Tower (ie when aero drag equals gravitational force)?
Simple maths suggests (given that terminal velocity of a 'skydiver' is reckoned to be about 53m/sec and the tower is 158m) that the human will make it before impact (at circa 120mph).

 

[DaveReading]

[QUOTE 5257854, member: 9609"]because the effect of the wind is exponential. the faster you go the more effect it will have[/QUOTE]

Not exponential, but drag is proportional to the square of airspeed, as Wilbur and Orville Wright knew more than a century ago.

 

[classic33]

Try dropping a hammer and a feather and see which hits the ground first.....

Where do you get hold of 2lb feathers though?

 

[Kajjal]

The simple test is get a small 1kg metal sphere and a 1kg Piece of cardboard with a huge surface area. Drop both from 100m up and they will not hit the ground at the same time.

 

[DaveReading]

[QUOTE 5258149, member: 9609"] But surely being proportional to the square or the cube is exponential ?[/QUOTE]

No. An exponential function is of the form y = a to the power of x. That's not the same as saying y = x to the power of 2 (or 3, or anything).

 

[Levo-Lon]

Surly you should be having a pint to celibate your goat prowess..
Downhill is about bravery

 

[Gravity Aided]

And determination.

 

[si_c]

No. An exponential function is of the form y = a to the power of x. That's not the same as saying y = x to the power of 2 (or 3, or anything).

Yes it is, we're talking exponential growth, not functions.

 

[classic33]

https://www.cyclingpowerlab.com/CyclingAerodynamics.aspx

 

[Ming the Merciless]

No. An exponential function is of the form y = a to the power of x. That's not the same as saying y = x to the power of 2 (or 3, or anything).

Nothing stopping x being 2 or 3. Y = x^2 is an exponential function as is y=x^3. Y = x^4 etc.