00:01
All right, so let's say we have a beam supported by two supports, where we have support a here, support b is here, and a weight is placed at point d.
00:14
We're told this distance is 12 meters, this distance is 3 meters, and then the total length of the beam, we'll call this l, is 20 meters.
00:23
And we want to find the force support a exerts if the weight at this point of this block, is 200 newtons and we're told the beam itself has a weight of 550 newtons presumably acting about the midpoint so let's choose point b is our pivot point so what we'll have is the force exerted by a going upwards is going to produce a torque so if we look at the net torque on this situation let's measure it relative to this pivot point so it'll be negative f a times 12 meters negative because this this is 12 meters to the left of our point of interest.
01:05
And then plus the are really, yeah, plus the weight of our beams.
01:10
So 5 .50 newtons times the distance.
01:14
Now, it's acting about the 12 meter point or sorry, the 10 meter point of the board because it's in the center.
01:21
And so this is this total distance is 15 meters.
01:26
So this is going to be five meters inwards.
01:28
That's where the center of...