78 results for: forces

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The surprising interactions between copper and neodymium magnets

...the greater the loss of kinetic energy of a magnet (a product of its mass and speed), the greater the heat buildup in the conductor and the more forceful the...

Getting dressed in 18th century England

...of the Second World War when most servants left their employers and joined the armed forces.” Follow this with these videos: Weaving on Mount Vernon’s 18th Century Loom and combat...

Nowhere and Everywhere at the Same Time, No. 2

...more than 400 pendulums are activated to initiate a sweeping 15 part counterpoint of tempi, spacial juxtaposition and gradients of centrifugal force which offers the spectator a constantly morphing labyrinth...

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,...

An unexpected way to inflate a balloon – Numberphile

The kamifusen is a traditional Japanese paper (kami) balloon (fusen) toy that became popular in the 1890s and can still be found in a variety of designs or...

How does your body know you’re full?

...almost impossible to ignore. After you’ve reacted by gorging on your morning pancakes, you start to experience an opposing force: fullness. But how does your body actually know when you’re...

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...

Demonstrations of the Coanda Effect

...its explanation depends on viscosity, the frictional forces between the molecules of a fluid (be it liquid or gas). The Coanda effect is the culprit behind many everyday incidents as...

Hydrodynamic Levitation

...third law, the force on the water by the ball is equal and opposite to the force of the water back on the ball, pushing it up into the stream....

Step into a summer igloo (in 360°) as it’s being built

...on a parabola, not a semicircle, eliminating the forces that would make a true hemisphere bulge and collapse. Snow is an excellent insulator, trapping air between the snowflakes, while white...

J is for Joule – Circuit Playground

...weighs approximately one Newton. Thus, you’d have to exert a one Newton upward force to counteract its one Newton weight. Once you’ve lifted it up to a height of one...

How Do Pelicans Survive Their Death-Defying Dives?

...of its bill is essential, reducing “hydrodynamic drag” — buckling forces, caused by the change from air to water — to almost zero. It’s something like the difference between slapping...

Why the Giant Sequoia Needs Fire to Grow

...how a destructive force is necessary for new life in this clip from Nature on PBS. Some background from nps.gov: In the early 1960s, Dr. Richard Hartesveldt explored the...

Almost-invisible hydrogel robots that can grab quickly

...a similar level of transparency, force, and speed.” The researchers envision a future where these hydrogel robot parts might help in medical operations or work as unseen underwater robots. File...

What can you do with a large neodymium magnet?

Neodymium magnets are really strong. The larger they get, the more careful you need to be to avoid being pinched or struck from the force of their attraction. This...

The toy-inspired Paperfuge, an innovative new tool in healthcare

...samples of the patient’s blood, urine, or stool in a centrifuge. Thanks to centrifugal force, the spinning motion separates cells of different weights—such as pathogens in the blood—from the rest...

Why are Dalmatians the Traditional Dog of Choice at Firestations?

...of a boiler which was able to use steam to force water out of hoses and onto a fire. The fire brigade’s horse-drawn carriages would be loaded up with the...

(Skate)ology & The Science of Skateboarding: Grinding

Kick flips, nose grinds, backside board slides… (Skate)ology! Examine gravity, friction, momentum, and other physics concepts thanks to skateboarding demos by pro skaters Boo Johnson, Dane Vaughn, Marquise...

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