The Force Of The Ladder Against The Wall

  • Thread starter Coldry
  • Start date
  • #1
Coldry
1
0
OK folks, I'm sure this will be easy for the brains in this forum, but I've always been curious as to how this is done. So if you have situation where you have a ladder leaning on a wall and a person is some way up the ladder. If you know the length of the ladder (3m), the angle the ladder is leaning (50 Degrees at the bottom inside the triangle made by the ladder the floor and the wall), the weight of the ladder (10 kg), the weight of the person (110kg) and exactly how high up the ladder the person is (2.5m), how would you calculate the force the ladder is applying on the wall at the top of the ladder?

So I've put some random numbers for parameters here. I don't understand or know the maths involved, so if you need to make some of these numbers different to simplify the explanation please go ahead. Drawings would be appreciated.


Thanks
 

Answers and Replies

  • #2
BvU
Science Advisor
Homework Helper
15,278
4,254
Hello @Coldry,
:welcome: ##\qquad## !​

I can understand you feel unable to do the calculation, but I have little patience with
Drawings would be appreciated.
because I have absolutely no idea why you can't come up with at least an initial sketch !

So post that (*) and then we'll talk about the necessary equilibrium of forces, as well as about the equilibrium of torques that is needed to solve this one.
By the way, is this homework :wink: ? Because in PF, this exercise definitely qualifies as such...

[edit] (*) that will also show how realistic your random parameter values appear :nb)

##\ ##
 
  • #3
berkeman
Mentor
64,195
15,447
I don't understand or know the maths involved,
Have a look at this introductory reference to see if it helps:

https://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=&cad=rja&uact=8&ved=2ahUKEwihj8_Li977AhURDjQIHVuABUEQFnoECBkQAQ&url=https://www2.tntech.edu/leap/murdock/books/v2chap3.pdf&usg=AOvVaw0To34gQZmjX4ZF4gRu7hiy
1670092837736.png


And then draw a sketch of the ladder and floor and wall, and show where the forces and moments (torques) are acting on it. We can help better once you've skimmed the reference and show us your initial sketch. Thanks.
 

Suggested for: The Force Of The Ladder Against The Wall

Replies
35
Views
1K
Replies
2
Views
585
Replies
7
Views
534
Replies
12
Views
509
  • Last Post
Replies
6
Views
323
Replies
1
Views
288
Replies
25
Views
2K
Top