Recent postsView all

Individual investigation
13 Apr 19
6 Apr 19
1000 questions
30 Mar 19
Student access
30 Mar 19
IA again
27 Mar 19
Instruction videos
24 Mar 19
It's omega not double u
13 Mar 19
Standing on shoulders
7 Mar 19
Gp4 project live
4 Mar 19
14 Feb 19
Gp4 hands off / hands on
10 Feb 19
Wolf blood moon
22 Jan 19

Causing tension

Saturday 13 October 2018

Omar had been doing the Masses and pulley practical but wasn't convinced that the tension in the string was the same at both ends. How can it be when the masses are different. My attempts to explain weren't convincing and efforts to prove it mathematically led nowhere. If you break this down into a three body problem you have to give the rope some mass and then you realise that if the forces were the same at each end it wouldn't accelerate. However if the string is massless the tension at each end will be the same. So Omar was right, the tension isn't exactly the same unless you state the string is massless.


To post comments you need to log in. If it is your first time you will need to subscribe.