00:01
Okay, so we have this system.
00:03
We're asked, first of all, what direction it's going to accelerate.
00:06
It seems most likely that it's going to accelerate in the direction of the 100 kilogram mass.
00:13
So i'm actually going to draw my a in that direction.
00:18
So when i draw the free body diagrams, that will go into those, and then we'll be able to figure out if it's actually positive.
00:28
So free body diagram.
00:29
So first of all, let's begin with the 100 kilogram weight.
00:40
All right.
00:41
So it's got, let's call it m1g pointing down.
00:46
It's got a normal force.
00:50
And one that's perpendicular to the plane, and then it has a tension.
00:57
The tensions in this is the same because there's no friction.
01:01
So on both sides of the pulley, the tension's going to be exactly the same.
01:07
All right.
01:07
So we don't really care about the normal forces because there's no friction.
01:13
So we basically have to solve this equation and this one for the acceleration and the tension...