A community of Physics Phans!

Hi there,

I've just built a crane (well, actually a jib arm), to be used on a film dolly with
a camera on one end and a counterweight on the other to balance it.
I'm a bit worried about the weight I'm putting on the bearings and so I started
calculating. But I'm having a bit of trouble figuring out how much weight is
being put on each point. How much weight is PIVOT POINT A taking and how
much weight is PIVOT POINT B taking? Could someone enlighten me?
The MAIN ARM has a mass of 2.1 kg/m and the CONTROL ARM has a mass of
1.1 kg/m. Then there is the mass of the camera on one end and a massive
counterweight on the other end. Does PIVOT POINT B actually take any weight?

Thanks very much for any help.

Warning: is_dir() [function.is-dir]: open_basedir restriction in effect. File(/f1/content/ilovephysics/public/forum/uploads/) is not within the allowed path(s): (/f2/ilovephysics/:/nfsn/apps/php5/lib/php/:/nfsn/apps/php/lib/php/:/nfsn/content/content/nfsn/) in /f2/ilovephysics/public/forum/include/image_upload/image_upload.php on line 30