00:01
Okay, so let's say we have a horizontal surface like this with a block a resting on it, and it's connected via a string running over a frictionless, massless pulley to another block b.
00:14
And we're told the mass of block a is 13 kilograms.
00:19
The mass of block b is 7 kilograms.
00:24
And so we want to determine the acceleration of each block given us.
00:28
So let's look at the free body diagram of block a.
00:31
We're going to have m .a.
00:34
Times g going this way, and then the normal force from the table going this way, and then we're going to have the tension in the cable this way.
00:41
And there's no frictional force, so those are our three forces.
00:44
And for block b, we're going to have mb times g going this way, and the tension, which is going to be the same magnitude as the tension in the other string, or the other side of the pulley...