00:01
Okay, so we've got a truck of 8 ,500 kilograms and a trailer, 27 ,000 kilograms.
00:05
We want to start by identifying the forces acting on these.
00:09
So for the truck, we're going to have gravity, normal.
00:17
The problem tells us that there is a force f from the engine.
00:23
Okay, so f is pushing forward, and then you've got the tension backward.
00:31
Okay, so those will be the forces on the truck.
00:34
On the trailer, you're going to have a tension forward, and that's going to be a newton's third law pair with this tension, which we'll get to in a little bit here.
00:45
Force gravity, force normal.
00:50
Those would be balanced.
00:51
These would be balanced here.
00:55
And i think they said no friction and no air resistance.
01:00
So these would be your three forces on the trailer.
01:03
Okay, draw the free body diagrams for each, which we've already done.
01:06
Okay, write newton's second law equation for the truck and for the trailer.
01:11
So for the truck, it's going to be net force is equal to mass times acceleration...