00:01
What is the acceleration of the stack? so let's go ahead and draw our diagram, or a simplified free body diagram.
00:10
We have our acceleration, our force, and our force of friction for all the sum of our masses.
00:17
Now our acceleration is just our net force divided by mass.
00:21
So it's going to be our force minus our force of friction divided by the sum of our masses, where our force of friction is just equal to mu, times the sum of our masses.
00:38
So let's plug this into a calculator.
00:40
We have our 31 newtons minus .17 times of our masses, which is six kilograms divided by six.
00:49
Now let's plug that into a calculator.
00:52
We have 31 minus .17 times six divided by six, which gives us 4 .99 meters per second squared as our acceleration.
01:03
For b we'd like to find what is the force exerted by m1...