00:01
In this problem, you have a refrigerator that has a mass of all mr, a 57 kilograms, and there's a force on the refrigerator that's trying to get it to move that's negative 267 newtons.
00:21
And we're told that the coefficient of static friction is 0 .65 newtons.
00:28
So you want to find first, if the refrigerator is not moving, what is the force due to static friction? and then, for part b, what is the force required to get this refrigerator to move? so to do this, we need a first draw a free body diagram of the refrigerator so that we can use newton's second law, which is some of the forces f equals mass times acceleration.
00:55
But here, since there's no movement of the refrigerator, this just becomes zero, making the calculations a lot easier.
01:02
So first, the free body diagram.
01:04
So here's the refrigerator.
01:06
So we have the weight of the refrigerator pushing down.
01:11
So that means we have the normal force in the opposite direction.
01:15
So since the force of the push is a negative number, that means it's in the negative x direction.
01:20
So it's like this.
01:22
I just call it f.
01:24
So that means static friction is in the opposite direction of that push...