00:01
Okay, so we've got 150 pound student on a ferris wheel.
00:04
And so here's our ferris wheel.
00:08
It says at the highest point, the scale reading is 125 newts.
00:13
So let's look at the highest point here.
00:16
At the highest point, the force of gravity is 150.
00:18
That's the weight of the student.
00:20
But the normal force or the scale reading is 125.
00:25
This makes sense because in circular motion, you have to have a net force toward the center.
00:29
So the net force is 25, which is 150 minus 125.
00:37
Okay.
00:38
At the bottom here, you're still going to have a force of gravity of 150, but your normal force has to be bigger because, again, the net force must be toward the center.
00:52
And assuming the same net force of 25, that would give you a normal force that's 25 bigger than 150 or 175 newtons.
01:02
This would be my answer for part a.
01:03
The scale reading at the lowest point would be 175.
01:06
Assuming this, ferris wheel is moving at a constant speed, which is implied in the question here.
01:13
Okay, second part, they're asking, what if we doubled the speed? how would that affect the ferris wheels? how would that affect the normal force? so there are two equations to think about here...