00:01
So we have a pulley system with two blocks.
00:06
We have block m1 up here attached to this pulley.
00:16
And at the other end, we have block m2.
00:22
We're told that m1 has a mass of 5 kilograms, and m2 has a mass of 4 kilograms.
00:34
So the first part of the question is asking us to calculate the acceleration once this is not at rest anymore.
00:44
So to do that, let's go ahead and draw our forces on the free body diagram.
00:49
We don't have to take friction into account because we're told that the surface underneath m1 is smooth.
00:57
So here the only force acting on m1 is going to be the tension.
01:04
Force in this direction.
01:09
And on m2, we have the force of gravity, and then we also have the tension force counteracting it.
01:20
So this is pretty straightforward.
01:23
We have to write down our equations using this free body diagram.
01:29
And our equation for mass 1 is going to be that the ten tension is equal to mass 1 times the acceleration.
01:48
And our second equation is going to be the acceleration due to gravity times a mass minus the tension force.
01:59
So we're taking this direction to be the positive direction, since that's the direction that this whole system is traveling...