Recent postsView all

The big bang
10 Sep 19
Going to extremes
10 Sep 19
Unit Plans
1 Jun 19
Getting started?
26 May 19
Practical work (and Paper 3)
17 May 19
Group 4 Project
11 May 19
Single slit distraction
8 May 19
Extended Essay
4 May 19
25 Apr 19
IA 2019 reflections
20 Apr 19
20 Apr 19
Individual investigation
12 Apr 19

Causing tension

Friday 12 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.