# Topic:gravity

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## Green Ball Adventure, a Sprice Machines chain reaction

Follow this green ball on an adventure across a series of contraptions and chain reactions set up on a pegboard wall. This new screen link video from Steve Price of Sprice Machines features dominoes, pulleys, levers, ...

## How do crab spiders use their silk to fly?

Some spiders can catch onto breezes that send them flying across oceans and high up into the skies by ballooning—releasing "numerous strands of silk that they spin up to six feet long." And those threads of silk, ...

## A lemon-powered supercar and making the world’s largest lemon battery

Can you power an electric supercar with lemon-power? It depends on the lemon-power. In the video above, science YouTuber and former NASA JPL engineer Mark Rober attempts to fill a 48-kilowatt-hour battery with electri...

## Observing the angle of repose with DIY physics devices

The angle of repose or critical angle of repose is how steep various types of materials can be piled without slumping. The steepness of the side of a pile is determined by the amount of friction between the particles ...

## Kris Kremo juggles cigar boxes

Juggling legend Kris Kremo began juggling balls, hats, and cigar boxes onstage with his father Béla Kremo in 1970 at age 19, and joined The Blackpool Tower Circus as a solo performer five years later. In this low-...

## Math in Motion: Playing with a desktop Galton Board

This delightful little device brings to life the statistical concept of normal distribution. As you rotate the Galton Board on its axis, you set into motion a flow of steel beads that bounce with equal probability to ...

## Balanced bottle sculptures by balancing artist Rocky Byun

Balancing artist Rocky Byun has filled his YouTube channel with patience and practice. In his videos, he balances rocks, chunks of ice, bicycles, sticks and other objects, but perhaps his signature medium is the glass...

## The Cake Server, a delightfully complex food-themed Rube Goldberg Machine

Rube Goldberg Machines are not only made from a series of imaginative engineering marvels, they're also well-known for being overly complex in comparison to the task achieved. In this intricate machine by Joseph Hersc...

## Spinners, a Kaplamino marble run with 10 fidget spinner tricks

Ten fidget spinner tricks keep this marble run moving slowly but steadily forward in one long and delightful take. Spinners is the latest chain reaction video by marble run aficionado Kaplamino. There are more Kapl...

## The Blue Marble, an uninterrupted catapult-filled magnet marble run

After 3 months of work and probably more than 500 fails, I'm happy to present you my best video ever. Since magnets and marbles I've always wanted to make a big chain reaction in one take with this 2D style! It's ...

## The surprising interactions between copper and neodymium magnets

Experiments with super strong neodymium magnets and copper! These surprising demonstrations of magnetic damping go beyond the magnet through a copper tube demo that we've previously seen. Watch as Night Hawk in Light ...

## Dance & the physics of rotation – PBS Kids’ What’s Good

Dance, twirl, flip, extend, spin, twist, leap, defy gravity and get to know the science of movement that drives it all. Breakdancers B-Girl Eren and Tori Torsion talk about why they love to dance, and how practice, ha...

## Red Ball Adventure, a chain reaction marble run on a pegboard wall

Follow a little red ball through this super fun pegboard wall mounted adventure. Inspired by Biisuke Ball and Magnets and Marbles, two instant internet video classics, YouTuber Steve Price of Sprice Machines created t...

## Nowhere and Everywhere at the Same Time, No. 2

Swinging plumb bobs hang in a gridded formation across a large room as visitors attempt to walk among them without making contact. The installation, Nowhere and Everywhere at the Same Time, No. 2 by William Forsythe, ...

## Liquid Sand Hot Tub: Making a giant fluidized bed of sand

When air is pumped through sand in just the right way, the sand begins to behave a lot like a fluid. As air escapes between the sand particles, items placed in the sand will begin to float. Others will sink. And when ...

## A microgravity demo in the Willis Tower Skydeck elevator

The next time you ride an elevator down 103 floors, take a scale with you, because you might want to try this microgravity experiment: In collaboration with Willis Tower, Kevin from the Museum of Science and Industry,...

## The mighty mathematics of the lever

Archimedes once said “Give me a place to stand, and I shall move the Earth.” While the idea of a person moving such a huge mass on their own might sound impossible, chances are you’ve seen this idea in action at your ...

## A ramp and pulley marble machine game

This simple marble machine game made from ramps and a pulley system moves marbles from the bottom of the course to the top, circulating them over and over again. The kid playing the game is able to keep the three marb...

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