Register to reply

Ladder leaning against the wall, that we dont want to fall down

by hellbike
Tags: fall, ladder, leaning, wall
Share this thread:
hellbike
#1
Jan21-10, 07:16 AM
P: 61
problem:

ladder is leaning against the wall.

There is friction between ladder and wall - f1

and there is friction between ladder and ground - f2

what is the minimal angle between ladder and ground that ladder doesn't fall down.



I though it's easy, but then i realized it's not only about force - it's also about "circle motion" (you know what i mean). I dont know hot to solve it.


tell me if my description itn's clear so i'll make picture.
Phys.Org News Partner Science news on Phys.org
Experts defend operational earthquake forecasting, counter critiques
EU urged to convert TV frequencies to mobile broadband
Sierra Nevada freshwater runoff could drop 26 percent by 2100
tiny-tim
#2
Jan21-10, 12:08 PM
Sci Advisor
HW Helper
Thanks
tiny-tim's Avatar
P: 26,148
Hi hellbike!

You need to very carefully give names to the horizontal and vertical components of all the forces, and then balance the horizontal and vertical components (separately), and also take moments about some suitable point.


Register to reply

Related Discussions
Ladder leaning against a vertical wall. Classical Physics 3
Finding a friction force (ladder leaning against a wall...) Introductory Physics Homework 3
Ladder leaning against a wall Introductory Physics Homework 4
Ladder against wall - what is friction needed to prevent ladder from slipping Introductory Physics Homework 4
Leaning ladder Introductory Physics Homework 7