By continuing to use this site, you agree to our use of cookies. Find out more
Forum sponsored by:
Forum sponsored by CML

A question of physics.....

a simple little question, or is it?

All Topics | Latest Posts

Search for:  in Thread Title in  
Mike Blandford16/10/2016 22:58:49
avatar
506 forum posts
22 photos

Ted: I thought from your earlier posts you didn't think the 747 would take off, hence my question.

Mike.

ted hughes16/10/2016 22:59:34
avatar
466 forum posts
Posted by Gary Manuel on 16/10/2016 22:55:15:
Posted by ted hughes on 16/10/2016 22:45:22:

Imagine it this way:

The plane sits on the belt.

The belt starts to move backwards slowly.

The plane won't move - its wheels will turn, but because of the absence of friction, the fuselage will remain stationary.

Open the belt to 1000kph , and the plane still won't move. It wheels will turn faster though.

Stop the belt and open the plane's throttles.

The plane will start to move forwards, and the belt will start to move backwards at increasing speed to match the speed of the plane.

However, we have already demonstrated that the movement of the belt does not affect the fuselage, which is getting its thrust quite independently from the belt (unlike the running man, who is using the backwards-moving belt to provide his impetus).

Therefore, there is no reason why the plane should not take off as normal.

Edited By ted hughes on 16/10/2016 22:46:23

Ted. You've finally got it!!!!!

I can't fault anything you've said here.

The puzzle of the plane on the belt was discussed in my "O" level physics class 40 odd years ago!

Gary Manuel16/10/2016 23:02:55
avatar
1844 forum posts
1507 photos
Posted by ted hughes on 16/10/2016 22:59:34:

The puzzle of the plane on the belt was discussed in my "O" level physics class 40 odd years ago!

Which side of the argument were you supporting back then?

ted hughes16/10/2016 23:05:10
avatar
466 forum posts
Posted by Gary Manuel on 16/10/2016 23:02:55:
Posted by ted hughes on 16/10/2016 22:59:34:

The puzzle of the plane on the belt was discussed in my "O" level physics class 40 odd years ago!

Which side of the argument were you supporting back then?

The most amusing.

WolstonFlyer16/10/2016 23:06:01
avatar
2104 forum posts
189 photos

I am sure the EU have re-written the laws of physics since then, they like to do things like that for no reason 😂

Gary Manuel16/10/2016 23:11:13
avatar
1844 forum posts
1507 photos
Posted by ted hughes on 16/10/2016 23:05:10:
Posted by Gary Manuel on 16/10/2016 23:02:55:
Posted by ted hughes on 16/10/2016 22:59:34:

The puzzle of the plane on the belt was discussed in my "O" level physics class 40 odd years ago!

Which side of the argument were you supporting back then?

The most amusing.

Well I've enjoyed the discussion.

Not sure I believe that you knew the answer all along though, but well done for playing devils advocate if you did. Always good to have one of those in an argument.

Edited By Gary Manuel on 16/10/2016 23:13:31

Biggles' Elder Brother - Moderator16/10/2016 23:14:19
avatar
Moderator
15748 forum posts
1460 photos
Hi
Well everyone has had a more than ample chance to make their case. At the request of the OP and others we think that maybe this has run its course and we should close it while everyone is still friends!
BEB

All Topics | Latest Posts

This thread is closed.

Magazine Locator

Want the latest issue of RCM&E? Use our magazine locator link to find your nearest stockist!

Find RCM&E! 

Latest Forum Posts
Support Our Partners
Slec
Pepe Aircraft
Wings & Wheels 2019
Gliders Distribution
CML
Revoc
electricwingman 2017
Motion RC
Advertise With Us
Sarik
Latest "For Sale" Ads
Does your club have a safety officer?
Q: Does your club have a safety officer, or is the emphasis on individual members to each be their own safety officer?

 Yes we have a SO
 No, it's down to everyone

Latest Reviews
Digital Back Issues

RCM&E Digital Back Issues

Contact us

Contact us