00:03
Okay, so here we have a worksheet that looks like it's we're supposed to, it looks like it was assigned as a, as maybe something that was paired to a, maybe an online simulation or something that you could interact with based on the wording of the prompts.
00:26
But since we don't have that simulation here, i have to assume some things in order to provide you some answers here.
00:34
One is i don't know if this ramp is supposed to have friction or not according to, you know, if we place the skater at the top of the ramp and watch as he rides, then write what happens to the skater.
00:48
And, you know, if you did this on this, on whatever maybe simulation or whatever this was assigned with, maybe there's friction in the ramp and he eventually slows down and stops at the bottom eventually.
01:04
As he loses energy to friction.
01:06
The only issue is i don't know if that's the case or not because i don't have the context here, fully.
01:12
So what i'm going to do is provide you answers where there is not friction.
01:16
So i'm going to assume there's no friction on the ramp, and that's what my answers are going to be given from.
01:27
So for table one, if you put the skater at the top of the ramp and let him go and watched him as he rides, if there's no friction on the ramp, basically your result, i'm not going to write it here on the screen.
01:39
It's just too much to write in that little box there.
01:43
He's going to basically be pulled down the left side of the ramp, and he's going to be speeding up as he falls.
01:51
By the time he gets to the middle down here, he'll be going the fastest that he's going to be going, so have the maximum speed down here at the bottom.
02:00
And then he's going to go up the right side up here, and he's going to stop at the very top.
02:05
Right there where my cursor is.
02:09
So right here he'll stop.
02:11
And then he will go back down and do the same trip back up to the other side.
02:15
And he will just keep doing that forever.
02:18
As long as you let him go, he'll just keep doing that forever.
02:21
And the reason why is because, so the main reason why is the law of conservation, the law of conservation of energy.
02:33
That's the main reason why he just he never loses energy he he continuously goes back and forth from one side to the other because he always has the same amount of energy totally that he started with which got transferred into kinetic energy and back to potential energy and then got transferred back to kinetic energy and back to potential energy so it just keeps going back and forth between those two quantities, kinetic and potential.
03:07
Okay, so with that being said, we can do some of these down here.
03:12
It says click on the bar graph and run the skater through the ramp again.
03:17
Look at the arrow each time the image at each image, sorry, in the first column of the table, right whether the kinetic energy or potential energy was higher or the same at the point with the arrow points.
03:30
We don't have the bar graphs to look at, but we don't need them if we understand kinetic and potential energy.
03:38
So just in case, just in case we need it.
03:42
Kinetic energy is the energy due to mass and motion.
03:57
Let's put it.
04:00
It's the energy due to a moving mass.
04:07
And we can quantify kinetic energy k equals one -half mass times velocity squared.
04:18
We also know that potential energy, and the kind of potential energy we're talking about is gravitational.
04:31
Gravitational.
04:32
This is due to potential energy, gravitational potential energy is due to, the position of a mass in a gravitational field, like on earth.
05:03
And that's equal to, so gravitational potential energy, we use a capital u for potential energy in physics.
05:09
You can also use a p, e, for potential energy.
05:14
That is equal to an object's mass times gravity, times the high.
05:21
Is how that's written pretty straightforward in that kind of way.
05:26
So these are going to be the two quantities we're going to be thinking about as we look at these diagrams here.
05:33
So which is higher here, kinetic energy, the potential energy, or are they the same? and why do you think that way? well, i'm going to do something extra here.
05:47
I'm going to make the bottom down here the zero.
05:52
Line and this is something that you may or may not be taught in your classes right now and that's okay if you're not it's actually something really easy you can do just like i'm doing on this picture here i'm just what i'm doing is i'm finding the lowest point that the skater is going to go and i'm putting a zero line right there and that zero line represents it represents the point here where the the skater will not have any more potential energy.
06:25
So if the skater falls all the way down the ramp to the bottom right here and hits this point right here, which lies on this zero line right here, then that skater has no more potential energy...