This site uses cookies. By continuing to use this site you agree to our use of cookies. To find out more, see our Privacy and Cookies policy.
Skip to the content

Free weekly newswire

Sign up to receive all our latest news direct to your inbox.

Physics on film

100 Second Science Your scientific questions answered simply by specialists in less than 100 seconds.

Watch now

Bright Recruits

At all stages of your career – whether you're an undergraduate, graduate, researcher or industry professional – can help find the job for you.

Find your perfect job

Physics connect

Are you looking for a supplier? Physics Connect lists thousands of scientific companies, businesses, non-profit organizations, institutions and experts worldwide.

Start your search today

Tag archives: mechanics

Reminiscing about Fermilab, CAPTCHA tests your physics, science of guitar strings

By Hamish Johnston

What do huge snowstorms, pioneering childcare and bison have in common? The answer is that they all feature in video recollections of Fermilab, the particle physics facility that is celebrating its 50th anniversary this year. A playlist of the videos is available and you can watch Cindy Joe’s musings over Snowpocalypse 2011 above.

According to physics blogger ZapperZ, the online retailer Amazon is developing a new CAPTCHA technology that relies on human’s innate understanding of the laws of physics. The idea, apparently, is that a user would be presented with before and after scenarios and asked which seem plausible. This could be a ball rolling down a ramp, or a projectile flying through the air. It seems that web robots can’t solve simple mechanics problems – at least for now.

Ending on a bright note, music technologist and erstwhile physicist Jonathan Kemp of the University of St Andrew’s in Scotland claims to have invented a revolutionary type of guitar string. He riffs on his new creation in the video above.

Posted in The Red Folder | Tagged , , | Leave a comment | Permalink
View all posts by this author  | View this author's profile

Testing the brain’s “physics engine”, lawnmower aurora alert and more


By Hamish Johnston and Tushna Commissariat 

You may not know it, but apparently you have a dedicated region in your brain that is your “physics engine”. At least that is what cognitive researchers from Johns Hopkins University are suggesting after they have pinpointed a specific region of the human brain that intuitively understands physics – at least when it comes to predicting how objects behave in the real world. According to the team, the engine is kick-started when we observe physical events as they happen and is “among the most important aspects of cognition for survival”. Surprisingly, the region is not located in the brain’s vision centre, but is actually the same area we tap into while making plans of any type. In the video above, the team has created a little game for you to test your engine’s horsepower – go ahead and tell us how you did.


Posted in The Red Folder | Tagged , , , | Comments Off on Testing the brain’s “physics engine”, lawnmower aurora alert and more | Permalink
View all posts by this author  | View this author's profile

Skateboard videos reveal the physics of doing an ‘ollie’

Free-body problem: how do skateboarders do an "Ollie"?

Free-body problem: how do skateboarders do an “ollie”? (Courtesy: Paulo Simeão Carvalho/Physics Education)

By Hamish Johnston

Here’s a problem for keen students of classical mechanics: how can a skateboarder cause their board to leap into the air by pressing down on it with their feet?

What I’ve described is a trick called the “ollie”, which first emerged on the skateboarding scene in the late 1970s and is now an essential part of the skating repertoire. There’s a fascinating paper in the journal Physics Education, which shows how digital videos of people doing an ollie can be analysed to get to grips with the physics underlying the trick.

The above image shows six video frames of someone executing an ollie – with time moving from right to left over a period of about 2 s. If you delve into the paper, you will find out how its authors – Marco Adriano Dias, Paulo Simeão Carvalho and Deise Miranda Vianna – used video images to track the motion of the tail of the board as well as its front and back wheels. This was then compared to a free-body diagram analysis of the forces of the board.


Posted in General | Tagged , | 2 Comments | Permalink
View all posts by this author  | View this author's profile

Balancing bicycles, looking back on Trinity, pricing up Pluto and more


By Tushna Commissariat

Mechanics was never my favourite topic when I was studying physics for my BSc, but I think I might have been more interested if we had looked at real-world situations rather than square blocks sliding down an incline plane. A bicycle that carries on, sans rider, without toppling over for quite a long time, for example, would have got my attention. This is a rather well-known quirk of mechanics though and it isn’t even the first time we have discussed it on the blog. Indeed, Physics World‘s James Dacey, a keen cyclist, delved into the topic in 2011. This week, we spotted a a new Minute Physics video on the subject, over at ZapperZ’s Physics and Physicists blog. Watch the video to get a good, if a tiny bit rushed, explanation of the three forces that come into play to allow a bicycle at a certain speed to zip along without its human companion. As the video suggests, all is not known about the secrets of free-wheeling bicycles just yet though, and I have a feeling that we will blog about it again in the years to come.


Posted in The Red Folder | Tagged , , , , , | 1 Comment | Permalink
View all posts by this author  | View this author's profile

The trebuchet challenge, the physics of ketchup bottles plus sage advice for budding science-fiction writers


By Hamish Johnston

“A surprising amount of stuff gets wasted every year because consumers can’t get it out of the packaging it came in,” writes Katie Palmer, who covers the science beat at Wired. In her article “The physics behind those no-stick ketchup and mayo bottles”, she explains how the company LiquiGlide has developed its slippery coating for the insides of bottles. The challenge was to create a permanently wet coating that would stick to the inside of the bottle but not mix with the liquid foodstuff – and it also has to be safe for human consumption.

LiquiGlide spun out of the lab of Kripa Varanasi at the Massachusetts Institute of Technology and has just announced that an international food-packaging supplier will be using the coating on its mayonnaise bottles. You can watch a demonstration of the coating in the video above.


Posted in The Red Folder | Tagged , | 1 Comment | Permalink
View all posts by this author  | View this author's profile

Villainous physicists, Hubble’s cat and more

Eddie Redmayne as Stephen Hawking

Eddie Redmayne as Stephen Hawking in the film The Theory of Everything. (Courtesy: Universal Pictures International)

By Tushna Commissariat

This week we heard about a possible new James Bond film villain and its none other than Stephen Hawking. According to this story in the Telegraph, he feels as if his trademark wheelchair and computerized voice would lend themselves perfectly to the part. On the same note, we saw this interesting feature on the Wired website that looks at the history behind Hawking’s very recognisable voice. Last month, I was lucky enough to attend an early screening of James Marsh’s Hawking biopic The Theory of Everything, which includes a rather touching and funny scene of Hawking testing out his voice for the first time. You can read more about the film in the reviews section of the upcoming January issue of Physics World.


Posted in The Red Folder | Tagged , , | 3 Comments | Permalink
View all posts by this author  | View this author's profile

Blockbuster physics, bowling balls and feathers in a vacuum, and more


By Tushna Commissariat

The results of a successful scientific experiment can make scientists very happy. Indeed, in the clip above, taken from the BBC TV series Human Universe, one scientist exclaims “holy mackarel!” when he sees the outcome he was hoping for. In the video, everybody’s favourite physicist Brian Cox carries out an experiment similar to Galileo’s Leaning Tower of Pisa experiment, where he tested that no matter the mass of objects, they fall at the same rate under gravity. In the video above, Cox drops a bunch of feathers and a bowling ball in the world’s biggest vacuum chamber – the Space Simulation Vacuum Chamber at NASA’s Space Power Facility in Ohio, US. In the slow-motion video, you can see with exquisite clarity just how accurate Galileo’s prediction was, as the feathers and ball land at precisely the same time. We came across this video on the Dot Physics blog on the Wired Science network, written by physicist Rhett Allain, where he has worked out some of the maths and pointed out some of the nuances of the above experiment, so make sure you take a look.


Posted in The Red Folder | Tagged , , , , , | 4 Comments | Permalink
View all posts by this author  | View this author's profile

Earth’s cousin, alien intelligence, Galileo’s game and more

Illustration of Kepler-186f

Artist’s illustration of Kepler-186f. (Courtesy: NASA/SETI Institute/JPL-Caltech)

By Tushna Commissariat

Early last week, astronomers announced that they had found the first Earth-sized exoplanet that is comfortably within the habitable zone of its parent star, using NASA’s Kepler telescope. The new planet, dubbed Kepler-186f, is a close cousin of the Earth as it has a radius that is only 10% larger than that of the Earth, meaning that it could have liquid water on its surface, allowing for the tantalizing possibility of some form of life to exist upon it. At last count, Kepler has now discovered and confirmed 1706 exoplanets.

So it was rather interesting to come across two stories that looked at the implications of life beyond our planetary neighbourhood. Paul Gilster, who writes the Centauri Dreams blog had a rather interesting post on how artists and illustrators need to work with scientists to depict each new exoplanet, to make the images look visually stunning, while still being scientifically accurate. Gilster also talks specifically about the image (see above) that illustrates the newly found Kepler-186f.


Posted in The Red Folder | Tagged , , , , , | Comments Off on Earth’s cousin, alien intelligence, Galileo’s game and more | Permalink
View all posts by this author  | View this author's profile

Bananaman, fusion boy, an astronaut and more

By James Dacey

The Red Folder is bulging this week with some weird and wonderful physics stories from around the Web. Here is a round-up of some of the best we have stumbled across.

One of the more eye-catching articles this week included the surreal image of Stephen Hawking posing for a picture with a bunch of men all dressed as Bananaman. In case you’re not familiar with this brilliant character, Bananaman is a comedy super hero created in the 1980s by British cartoonists who valued the importance of nutrition. When Eric Wimp – an ordinary British schoolboy – eats a banana he turns into our hero, a fully grown man in a blue and yellow suit with special powers to rival both Batman and Superman. Anyway, I digress. According to the Telegraph, the 10 besuited chaps in question were on a stag do in Cambridge. They were lost (perhaps a few too many banana liqueurs?) when they turned a corner and spotted the world-famous cosmologist getting out of a car. The result was a group shot with far more a-peel than any of those self-indulgent Oscars selfies that have been doing the rounds this week. Please accept my apologies for that bad pun.


Posted in The Red Folder | Tagged , , | Comments Off on Bananaman, fusion boy, an astronaut and more | Permalink
View all posts by this author  | View this author's profile