Congratulations, the acceleration of the bungy jump is greatest at the jumper s lowest point. This is because the bungy is now stretched to its maximum, meaning if applies a force up on the jumper more than twice his weight. This means he accelerates up at a greater rate than the acceleration down when he left the platform.

At the jumper s fastest point, the acceleration is by definition zero. That is because the jumper is going from speeding up to slowing down. At this instant then there is no change in the jumper s velocity. This is counter-intuitive for a lot of people because it s easy to confuse velocity with acceleration. Velocity is how fast something goes while acceleration is the rate at which velocity changes.

When the rope becomes taut, the force on the jumper is mainly his weight downwards, plus a bit of air resistance up. Therefore his speed is increasing nearly as much as it did when he leapt off the platform. So this is not the greatest acceleration of the jump.

When is the acceleration (rate of speeding up or slowing down) greatest during a bungy jump?

Help support videos like this: https://www.patreon.com/cgpgrey **CGPGrey T-Shirts for sale!**: https://www.cgpgrey.com/t-shirt

Post to Facebook - http://on.fb.me/lJOTzm Tweet this - http://bit.ly/BadBeard Macro photography lenses are usually quite expensive. This is a quick and dirty way to get a macro photograph no matter where you are. Most people look OUT the airplane window. I show you a neat method to look AT it. Click here to get the photos: - http://bit.ly/iF732E As promised, here is a link to the Macro Adapter.- https://amzn.to/2SJmmrS ~~~~~~~~~~~~~~~~~~~~~~~~~~~~ GET STUFF SECTION: (If I did this right these should be working Amazon affiliate links to purchase the stuff I like to use. When people purchase from these links it will support Smarter Every Day.) ❓Mystery Item (just for fun): https://amzn.to/35hEZrZ Things I use and like: 📷Camera I use : https://amzn.to/2VSiruw Favorite Lens: https://amzn.to/2KPDQ1a Wide-angle: https://amzn.to/2SlPchR On-camera Mic: https://amzn.to/2SJulF4 Lav Mic: https://amzn.to/3aRek6r Hot shoe mount for Lav Receiver: https://amzn.to/35m6uAo My Tripod: https://amzn.to/2Yl6RtJ My Multi-tool: https://amzn.to/2zGm5Pz Favorite SD Card: https://amzn.to/2KQ3Edz 💾How I get footage off my phone: https://amzn.to/2KMem4K Travel Tripod: https://amzn.to/2zEa9Oi My Backpack: https://amzn.to/35jveJL My Headlamp: https://amzn.to/3deYmVt Favorite Bidet: https://amzn.to/2xnMG3b World Map: https://amzn.to/3aTFCZT Favorite Shoes: https://amzn.to/3f5trfV Everyone needs a snatchblock: https://amzn.to/2DMR4s8 🥽Goggle Up! : https://amzn.to/2zG754g Also, if you’re interested in a Smarter Every Day shirt etc. they’re really soft and you can get there here: https://www.smartereveryday.com/store ~~~~~~~~~~~~~~~~~~~~~~~~~~~~

In Queenstown, New Zealand, I jumped off the Kawarau Bridge - the site of the first bungy jump. It was a thrilling experience, preceded by a terrifying, gut-wrenching half hour wait. All in all an awesome adventure, even if the woman fitting my harness didn t know the first thing about the acceleration of free-falling bodies.

Do we take the Earth for granted? It gives us life and sustains us in the manner we re accustomed to, but we don t know the first thing about it: like where did it come from? And how did it form? Most people recognize that the Earth has a big explosion in its history, which they refer to descriptively as the Big Bang. But there are two very good reasons why the Big Bang is not directly responsible for forming the Earth: 1) It happened 13.7 billion years ago. That s more than 9 billion years before the Earth formed (what happened during that time?), and 2) After the Big Bang the universe consisted of only Hydrogen and Helium - not great raw material for building the Earth. The truth is the big bang formed stars, which exploded and then (perhaps) formed more stars, which exploded and then formed our solar system, including the Earth. The early stars performed the vital role of making the heavier elements of which Earth is composed and we are made.

http://twitter.com/#!/SmarterYoutube I would appreciate it if you subscribed and click this -- http://on.fb.me/BulletArt We spent a whole day making some art in the manliest way possible. Contact Josh if you re interested in obtaining or commissioning a work of his art. Obviously there s a rust technique that the piece is put through after the stippling. As always, consider sharing this with your friends. Notice the cows in the top left at 1:34? If you like the music, check out the artist: myspace.com/inthegrovemusic https://www.facebook.com/pages/In-The-Grove/100833361840 Pennywhistle Productions ~~~~~~~~~~~~~~~~~~~~~~~~~~~~ GET STUFF SECTION: (If I did this right these should be working Amazon affiliate links to purchase the stuff I like to use. When people purchase from these links it will support Smarter Every Day.) ❓Mystery Item (just for fun): https://amzn.to/35hEZrZ Things I use and like: 📷Camera I use : https://amzn.to/2VSiruw Favorite Lens: https://amzn.to/2KPDQ1a Wide-angle: https://amzn.to/2SlPchR On-camera Mic: https://amzn.to/2SJulF4 Lav Mic: https://amzn.to/3aRek6r Hot shoe mount for Lav Receiver: https://amzn.to/35m6uAo My Tripod: https://amzn.to/2Yl6RtJ My Multi-tool: https://amzn.to/2zGm5Pz Favorite SD Card: https://amzn.to/2KQ3Edz 💾How I get footage off my phone: https://amzn.to/2KMem4K Travel Tripod: https://amzn.to/2zEa9Oi My Backpack: https://amzn.to/35jveJL My Headlamp: https://amzn.to/3deYmVt Favorite Bidet: https://amzn.to/2xnMG3b World Map: https://amzn.to/3aTFCZT Favorite Shoes: https://amzn.to/3f5trfV Everyone needs a snatchblock: https://amzn.to/2DMR4s8 🥽Goggle Up! : https://amzn.to/2zG754g Also, if you’re interested in a Smarter Every Day shirt etc. they’re really soft and you can get there here: https://www.smartereveryday.com/store ~~~~~~~~~~~~~~~~~~~~~~~~~~~~

I have 10 hours to figure this out. Help me disseminate! HOW WITHOUT DYING? I could use a little help figuring this one out. He lives so far back in the woods we can t get to it with a bucket truck. He wants the tree down so it is safe for his children.

Click here for the High Res photos --- http://on.fb.me/DragonPhotos http://twitter.com/SmarterEveryday Put on facebook-- http://on.fb.me/DragonsBreath . ... Tweet This!-- http://bit.ly/DragonBrth ~~~~~~~~~~~~~~~~~~~~~~~~~~~~ GET SMARTER SECTION: We investigated Dragons Breath ammunition with several different types of photography. High speed video, open shutter photography, muzzle cam, HD video, etc. Dragon s breath ammunition uses Particulated Zirconium as the burning source. Note the science lesson at the end of the video. ~~~~~~~~~~~~~~~~~~~~~~~~~~~~ GET STUFF SECTION: (If I did this right these should be working Amazon affiliate links to purchase the stuff I like to use. When people purchase from these links it will support Smarter Every Day.) ❓Mystery Item (just for fun): https://amzn.to/3cX2id4 Things I use and like: 📷Camera I use : https://amzn.to/2VSiruw Favorite Lens: https://amzn.to/2KPDQ1a Wide-angle: https://amzn.to/2SlPchR On-camera Mic: https://amzn.to/2SJulF4 Lav Mic: https://amzn.to/3aRek6r Hot shoe mount for Lav Receiver: https://amzn.to/35m6uAo My Tripod: https://amzn.to/2Yl6RtJ My Multi-tool: https://amzn.to/2zGm5Pz Favorite SD Card: https://amzn.to/2KQ3Edz 💾How I get footage off my phone: https://amzn.to/2KMem4K Travel Tripod: https://amzn.to/2zEa9Oi My Backpack: https://amzn.to/35jveJL My Headlamp: https://amzn.to/3deYmVt Favorite Bidet: https://amzn.to/2xnMG3b World Map: https://amzn.to/3aTFCZT Favorite Shoes: https://amzn.to/3f5trfV Everyone needs a snatchblock: https://amzn.to/2DMR4s8 🥽Goggle Up! : https://amzn.to/2zG754g Also, if you’re interested in a Smarter Every Day shirt etc. they’re really soft and you can get there here: https://www.smartereveryday.com/store ~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Music is "Armychair Funk" by A Shell In The Pit. Here s the link to download it http://bit.ly/SED_Album Instead of saving for my kids college, I make videos using the money I would have saved. The thought is it will help educate the world as a whole, and one day generate enough revenue to pay for their education. Until then if you appreciate what you ve learned in this video and the effort that went in to it, please share the video. If you REALLY liked it, feel free to pitch a few dollars towards their college fund by clicking here: http://bit.ly/KidsCollege Warm Regards, Destin

1, 2, 3 A song about lectricity because it powers our lives makes it possible for us to thrive because it powers our lives makes it possible for us to thrive Oh, 4, 5, 6, volts of potential difference makes electrons go round if the circuit is complete and sound Circuit s closed Voltage There Current Flows Power Everywhere We use AC, in factories and homes because we can transform it High voltage transmits with lower loss but low voltage is best for safety I said what is electricity? Well, so 1,2,3 a song about lectricty because it powers our lives makes it possible for us to thrive because it powers our lives makes it possible for us to thrive Oh, 4,5,6 volts of potential difference makes electrons go round if the circuit is complete and sound Heat makes steam turns turbines and a magnet in coils of wires We use AC, in factories and homes because we can transform it High voltage transmits with lower loss but low voltage is best for safety I said what is electricity? Oh yeah, Oh yeah, C mon! How d it be no energy of the electrical persuasion I know we d have no computers no internet or mobile phones yeah Powers the world Makes the world We need electricity yeah

An introduction to alpha, beta, and gamma radiation

http://twitter.com/#!/SmarterEveryDay SMARTER EVERY DAY - 1st episode. More filmed already. Please Subscribe I think this is going to be big... ~~~~~~~~~~~~~~~~~~~~~~~~~~~~ GET SMARTER SECTION: The Saiga 12 is basically an 12 guage in an AK-47 form factor. Usually when people see a fireball they are quick to call it an explosion or a detonation. In actuality, what they ve witnessed is a type of explosion called a "Deflagration". Many things are deflagrations. Logs burning in a fireplace are Deflagrating. The primer inside the shotgun is actually detonating. Lead Styphenate or Mercury Fulmanide are used in cartridge primers to start the pyrotechnic train in a bullet/shell. The primer itself is detonating, which kicks off the gunpowder which burns in the shell. Any powder detonations occur in the chamber. As the powder burns and begins to push the projectile out (gas seals with the barrel with something called an "obteration seal"). The powder in the barrel is also deflagrating. ~~~~~~~~~~~~~~~~~~~~~~~~~~~~ GET STUFF SECTION: (If I did this right these should be working Amazon affiliate links to purchase the stuff I like to use. When people purchase from these links it will support Smarter Every Day.) ❓Mystery Item (just for fun): https://amzn.to/3aPb1wn Things I use and like: 📷Camera I use : https://amzn.to/2VSiruw Favorite Lens: https://amzn.to/2KPDQ1a Wide-angle: https://amzn.to/2SlPchR On-camera Mic: https://amzn.to/2SJulF4 Lav Mic: https://amzn.to/3aRek6r Hot shoe mount for Lav Receiver: https://amzn.to/35m6uAo My Tripod: https://amzn.to/2Yl6RtJ My Multi-tool: https://amzn.to/2zGm5Pz Favorite SD Card: https://amzn.to/2KQ3Edz 💾How I get footage off my phone: https://amzn.to/2KMem4K Travel Tripod: https://amzn.to/2zEa9Oi My Backpack: https://amzn.to/35jveJL My Headlamp: https://amzn.to/3deYmVt Favorite Bidet: https://amzn.to/2xnMG3b World Map: https://amzn.to/3aTFCZT Favorite Shoes: https://amzn.to/3f5trfV Everyone needs a snatchblock: https://amzn.to/2DMR4s8 🥽Goggle Up! : https://amzn.to/2zG754g Also, if you’re interested in a Smarter Every Day shirt etc. they’re really soft and you can get there here: https://www.smartereveryday.com/store ~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Grey Merch: http://www.cgpgrey.com/merch

Sound waves in a tube of gas create flames of different heights that dance to the music. A metal tube with holes in it is filled with gas. The gas is lit to create a row of tiny flames. A speaker at one end plays sound into the tube, which creates a standing wave of sound: areas where air molecules are vibrating rapidly separated by areas where the air is fairly still. This produces the different heights of flames and allows the wavelength of the sound wave to be estimated.

I helped a gentleman run a Wood-Mizer Portable saw mill and cut up some Walnut trees. These machines are mechanical marvels. Everything is powered by a hydraulic pump driven by a gas engine. There s lots of room for human error. The mill has a power assisted log roller. I learned that an intelligent setup can reduce your labor tremendously. This is one of those cases where I ve had the files on my computer forever and just didn t think it would be well received enough to post in on YouTube. After making the time lapse I decided it was too interesting to not post it. Pennywhistle Productions

There seems to be confusion about what radiation is and where it comes from. Many people believe it is the radiation that comes directly from nuclear power plants that poses a threat to public safety. In fact it is the radioactive atoms, which can escape in the event of an explosion, that pose a safety risk. They can be scattered by the wind over hundreds of kilometres. Then they may be ingested or breathed in. If they release radiation at this point, it is damaging to the body s molecules and cells because the radiation is delivered directly to tissues.

Watch more adventures in voting here: https://www.youtube.com/watch?v=tUX-frlNBJY&list=PLqs5ohhass_RN57KWlJKLOc5xdD9_ktRg

On the surface of Earth all objects accelerate downwards at the same rate - at least, they re supposed to. But we all know dust, pieces of paper, and feathers fall slower. This is of course due to the influence of air resistance. In this experiment we use an evacuated cylinder to test whether a coin and feather really do accelerate at the same rate.