00:01
In this problem, i'm going to be doing a quick example on the relationships between forces, masses, and acceleration.
00:09
Okay, so what we have is a trucker who is carrying a load, mass l, of 10 ,000 kilograms.
00:20
He is driving a truck that weighs 20 ,000 kilograms.
00:27
And there's a coefficient of static friction between the truck bed and the load of us equals 0 .5.
00:38
And we want to find the minimum stopping distance that the truck will need to come to a stop safely without his load slipping on the truck bed.
00:48
So how do we do this? well, i know from newton's second law, the sum of the forces acting on an object equals the object's mass times excessive.
00:56
Acceleration.
00:58
And i'm looking at the load.
00:59
That's what we're concerned with slipping.
01:02
All right.
01:03
So that is mass of my load and load times acceleration equals the sum of the forces.
01:10
The only forces acting on it are the frictional force between the surface of the truck bed and the load itself.
01:19
Okay.
01:20
So mass times acceleration equals my frictional force.
01:25
And we know that that equals the normal force, massive load times g, times my coefficient of static friction.
01:34
I'll see that this drops out...