 Welcome back to Kids Fun Science. My name is Ken and today's experiment is the science behind the gravity or magnetic hill. As always adult supervision is required. What you need for this experiment is a gravity or magnetic hill. Gravity and magnetic hills are natural places that cars are put into neutral and seem to be moving uphill and a slightly sloped road showing in the picture here. Apparently defining the law of gravity which we have one by my house so we're going to show you the science behind it. This stretch of road is rather short 50 to 90 meters and only a few meters wide and surrounding by a natural hill or landscape without any buildings by. Pretty five different experiments to see to bust this magnetic hill thing. One turn off the car, put it neutral, release the brakes. Two measure the altitude from the bottom of the hill to the top of the hill. Three roll a plastic ball to see which direction it goes. Four use a bubble level to see where the bubble is on the angle of the road and five walk down the hill. Experiment one is turn off the car and put it in neutral and release the brake and see what happens and here is the results. All right so we're going to test gravity hill here. We're going to go uphill but I've got the car in neutral. I've turned it off and I've put the emergency brake down so we're going to give it a shot and see how it goes. Release the brake now. As we're going about two miles an hour we're picking up speed. I have no emergency brake going uphill. This is pretty crazy now we're at four miles an hour picking up speed five miles an hour. This is really crazy I mean our top speed we got to about five miles an hour. You could definitely look like we're going uphill here but you're going to see in the next couple of experiments that it debunks that. Tomorrow it's an illusion but it was pretty cool being in the car moving this fast and you can see it hits right in that typical stretch of road where it's 50 to 90 meters only a few meters wide in the surrounding areas hills and landscape without nearby buildings but it was pretty impressive to be able to go that fast and looking like you're going uphill which is pretty incredible. So here's experiment number two that's going to start showing you it's a little bit of an illusion as we're going to do that altitude from the bottom of the hill to the top. So here we are on the bottom of the hill and it's showing 1115 feet at the bottom of the hill. So then I went about the middle of the hill and it's showing 1111 feet and so that's about a four foot drop right there and if you're looking at the top now all the way to the bottom so you can see the hill side and it looks like it's downhill so now we're at the top of the hill and we're at 1099 feet so we've dropped 16 feet going uphill supposedly so that's what debunks it right there. And experiment number three here rolling a plastic ball so if it was magnetic it would want to pull it so the plastic ball should debunk it here too and we put it down and well reset it here just to make sure so it stops and it starts to roll which we think it was uphill so why would it be rolling uphill but we already saw the altitude earlier that's a 16 foot drop so it's going to continue to defy gravity here as it's rolling uphill which is pretty crazy but it looks pretty cool but we all know it's an illusion now that we're starting to see this with our experiment. So the fourth experiment I'm using a bubble level to see what side the bubble is the top of the bottom we're at the bottom of the hill to the right is the bottom and to the left is the top and you can see towards the bottom is showing it's up it's raised up when definitely when you look at it it's not right. So the fifth and last experiment was walking down the hill when we walked to get there we had we just added this experiment because our legs got really tight as we could feel that we were walking felt like uphill when we were actually walking down it should have been very easy but it was a little hard which we found as an extra experiment that just kind of proved the whole thing that it is an illusion there is no defying gravity or magnetic field so what we found on the internet is a whole bunch of different sites around the world on the gravity or magnetic hills here's a list of them and so the end results for us is there are several things that enable us to sense this way it looks like it's up the balance mechanism in our inner ears is one system we have the visual clues that are very important can be overriding the horizon cannot be seen at the or not level and it may fool us in the objects that we expect to be vertical that aren't really not the false perspective that we might also play in a role by not seeing the trees in line or a larger or smaller distance is a sensitive perspective thrown off these objects are far away but seem smaller than larger and so on and so on at the end we came to the conclusion that this is just an optical illusion and we'd love to know your thoughts and comments below I hope you enjoyed this video remember to click thumbs up and to subscribe thanks for watching