Theres an advert on in the UK at the moment where a woman flies down and grabs the roof of a bus , her two feet in contact with the bus and pointing forward. She then 'pulls' the bus to a halt.
If she is applying a horizontal force backwards to overcome the the forward speed of the bus does not the Newtonian reactive force through the bus and directed forward cancel her effort leaving no net effect on the bus?
I can never work these things out but I suspect she's not flying at all and they may well have faked it!.
2006-09-15 01:51:49 · 3 answers · asked by Douglas M 2 in Science & Mathematics ➔ Physics
Nu-uh. That ad is false. You're right,the forces cancel each other. Similarly,when a child swings back and fro on a bus,the bus does not move more quickly or slowly...
2006-09-15 02:06:14 · answer #1 · answered by Cheng J 2 · 0⤊ 0⤋
Fake! You mean Superman is not real? I am shocked!
Seriously, there are all sorts of bad physics in Superman movies. If he were to to try and pick up a bus, his hands would just poke holes in it or break off the part he was holding, because buses are not that strong, even though Superman is.
2006-09-15 09:08:31 · answer #2 · answered by campbelp2002 7 · 0⤊ 0⤋
hmmmmm that one keeps me awake at nights....lol
2006-09-15 08:57:32 · answer #3 · answered by jocky674 1 · 0⤊ 0⤋