# Forces question

• July 3rd 2011, 05:15 PM
jgv115
Forces question
How would I go about doing this question:

http://i22.photobucket.com/albums/b3...Capture-14.png

Could I just make a triangle of forces and check the angles?
• July 3rd 2011, 05:57 PM
abhishekkgp
Re: Forces question
Quote:

Originally Posted by jgv115
How would I go about doing this question:

http://i22.photobucket.com/albums/b3...Capture-14.png

Could I just make a triangle of forces and check the angles?

force triangle method works.
another way would be to resolve the forces along two orthogonal directions.
• August 1st 2011, 01:18 PM
waqarhaider
Re: Forces question
By Lamy's theorem there is no equilibrium in both cases
$\frac{P}{\sin\alpha}=\frac{Q}{\sin\beta}=\frac{R}{ \sin\gamma}$