please help to find mu, frictional force and normal force


by jaybabbar
Tags: friction force, normal force
jaybabbar
jaybabbar is offline
#1
Nov7-10, 03:46 AM
P: 1
a body of 5 kg mass is resting on a board which is gradually tilted until, at an angle of 30 degrees to the horizontal, the body begins to move down the plane. find coefficient of friction and magnitude of the normal and frictional forces when the body begins to slip.

i managed to workout Force due to weight i.e. (Fw)x = 24.52N and (Fw)y = 42.47N also the Fn(Normal force) = 42.47 but i cant workout mu(coefficient of friction) as i dont have Ff(friction force) from the formula mu = Ff/Fn
Thanks
Phys.Org News Partner Science news on Phys.org
Cougars' diverse diet helped them survive the Pleistocene mass extinction
Cyber risks can cause disruption on scale of 2008 crisis, study says
Mantis shrimp stronger than airplanes
tiny-tim
tiny-tim is offline
#2
Nov7-10, 04:24 AM
Sci Advisor
HW Helper
Thanks
tiny-tim's Avatar
P: 26,167
hi jaybabbar! welcome to pf!

(have a mu: and try using the X2 icon just above the Reply box )
Quote Quote by jaybabbar View Post
(Fw)x = 24.52N and (Fw)y = 42.47N also the Fn(Normal force) = 42.47 but i cant workout mu(coefficient of friction) as i dont have Ff(friction force) from the formula mu = Ff/Fn
ah, but you know that the components of force in the x direction must add to zero
so you know that Ff = (Fw)x
jmb88korean
jmb88korean is offline
#3
Nov8-10, 08:58 PM
P: 34
The body moves at 30 degrees so you need to use trig to break it into components at that angle. The force going down the ramp must equal the frictional force at the point friction breaks. The force going into the ramp is equal to normal and using both you can find coefficient of friction.


Register to reply

Related Discussions
find the average frictional force Introductory Physics Homework 0
Frictional Force & Normal forces Introductory Physics Homework 7
How do you find frictional force with no mass given? Introductory Physics Homework 4
Please help, cannot find Frictional Force Introductory Physics Homework 6
Normal Force and Static Frictional Force Introductory Physics Homework 1