00:01
So in this problem we already have our good diagram here.
00:06
So we have our supports part way down the beam.
00:09
Now we know a torque is a force times the distance.
00:14
Now these two need to be perpendicular so if we look at say the 7 newton force at the left end we know that it's one meter away.
00:25
When we take our moments or torque, moment and torque are individual, i'll probably use moments like my habit is, but when we want to find the total torque about our axis we see we have all already have the perpendicular distances.
00:44
Now we're told to use the convention which is what most people use counterclockwise is a positive torque or moment.
00:53
So for the 7 newton force and we see if we take a 7 newton extend it around we see this is counterclockwise so that's a positive moment.
01:03
It's force 7 newtons one meter away.
01:06
I'm going to leave the units off so this equation is a little shorter.
01:11
So that's our first one.
01:12
Now for the 10 kilograms the actual force is 10 kilograms times the acceleration due to gravity g...