10 great physics courses you can take online right now, for free
Here are 10 physics courses you can take now with some of the best experts in the world.
- You can find numerous physics courses currently available online for free.
- Courses are taught by instructors with amazing credits like Nobel Prizes and field-defining work.
- Topics range from introductory to Einstein's theory of relativity, particle physics, dark energy, quantum mechanics, and more.
The internet has in many ways fulfilled its educational promise and can be an amazing resource to learn pretty much anything. This is especially true if you have an interest in physics, the study of matter, energy and the fundamental interactions and forces of our universe. There are hundreds of great free courses available, with field-leading and even Nobel Prize-winning instructors.
To get you started, we distilled through the resources to come up with a list of 10 courses you can take right now and get your physics journey under way.
Here we go:
A great intro course that looks at physics in the context of everyday objects and processes. How does skating work? Why do things fall? The course uses the cases of ramps, wheels, bumper cars and more to illuminate the physics of life around you. It is taught by the University of Virginia physics professor Louis A. Bloomfield, a noted science educator, lecturer, author, as well as tv host.
If you want to brush up on the essential concepts of physics, this course from Yale University might be for you. Taught by the physics professor Ramamurti Shankar, the lessons cover the principles and methods of physics, focusing on problem solving, quantitative reasoning and such concepts as Newtonian mechanics, special relativity, gravitation, waves, and thermodynamics.
Would you like to know about some of the most mysterious phenomena in the Universe? This fun course will bring you up to speed on white dwarfs, supernovae, neutron stars and black holes.
The 9-week course from the Australian National University has over 60,000 people enrolled, and is taught by Brian Schmidt, a Nobel Prize-winning physicist for his work on discovering dark energy. His co-teacher is the science educator and astrophysics researcher Paul Francis, who has a PhD from the University of Cambridge and has worked with NASA. He is particularly known for working on the spectra of quasars.
Want to get a general introduction to some of the main ideas about how the Universe was formed and where it's going? The Big Bang, the formation of the elements, the Higgs Boson, dark matter, dark energy and anti-matter all feature prominently in this 14-hour course, offered by the University of Tokyo.
It is taught by Hitoshi Murayama, a University of California, Berkley physics professor and the Director of Kavli Institute for the Physics and Mathematics of the Universe.
Want to understand Electricity and Magnetism? Take this course that currently has over 16,000 online students! This course was created by Scott Redmond, who worked previously in support of the International Space Station as a Mission Operations Analyst and conducted astronaut training before turning to teaching physics. The course offers 46 lectures in over 4 hours of video content and additional materials.
This interesting 8-week course, taught by Stanford University's Academic Director and historian of science Larry Randles Lagerstrom, goes deep into how Einstein came up with his famous theory. While setting up the background in both history and theory, the class provides a richer understanding of the theory of relativity itself.
This advanced 7-week course from MIT will teach you the basics of quantum mechanics, introducing such concepts as wavefunctions, the Schrodinger equation, uncertainty relations and the properties of quantum observables. The course is intended for people with previous college-level calculus and physics courses under their belt.
The currently archived but available course is taught by the MIT physics professor Barton Zwiebach, a specialist in string theory and theoretical particle physics, along with MIT physics lecturer Jolyon Bloomfield.
If learning about the workings of very small things sounds appealing and you love supercolliders, this is the course for you. In this class you will learn about subatomic physics, including the properties of atomic nuclei, how to detect and accelerate particles, as well as about electromagnetic, strong and weak interactions. And, of course, the Higgs Boson makes an appearance. The lessons will also talk about how to connect particle physics to astrophysics and the larger questions of the Universe.
This 31-hour course from the University of Geneva is taught by professor Marin Pohl, who works in experimental particle physics on European colliders like the LHC (Large Hadron Collider) in Switzerland. His current focus is astroparticle physics in space. The course's second teacher is assistant professor Anna Sfyrla, an experimental particle physicist, who teachers at the University of Geneva.
Is the Universe made of strings? If you're ready to dive into some of the headier explanations for everything in existence, take this great master class which can be completed in a few hours. It is taught by the Harvard University physics professor and string theory expert Cumrun Vafa, and was developed with the world-renowned string theorist Andrew Strominger.
If you want to further under understanding of Einstein's theory of relativity, you'd be interested in its connection to astronomy as explored in this course from Cornell University. Taught by astronomy professor David F. Chernoff, an expert in theoretical astrophysics, the lessons will deepen your knowledge by zeroing in on special and general relativity as well as experimental tests you can carry out to study them. You will also get to analyze paradoxes in special relativity and learn how relativity affects daily situations.
The prerequisite for this 4-week (currently archived but available) course requires at least high school level math and physics or an intro college course in both.
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Researchers documented the most common negative side effects of smoking weed, and who might be most susceptible.
- A team of researchers identified a total of 26 possible adverse reactions to cannabis use.
- Coughing fits, anxiety, and paranoia are among the top three most common adverse reactions to smoking weed.
- It was the people who smoke on a less frequent basis who were more likely to have had the bad experiences.
The most common adverse effects of pot<p>As it turns out, coughing fits are among the top three most common adverse reactions to cannabis use, along with anxiety and paranoia, according to a new study published in the <em>Journal</em><a href="https://jcannabisresearch.biomedcentral.com/articles/10.1186/s42238-019-0013-x" target="_blank"><em> of Cannabis Research</em></a>. </p><p>Now that weed is legal in the state, a team of researchers at Washington State University sought to document potential negative reactions to cannabis in order to paint a detailed picture of the effects of smoking weed for newbies. The authors surveyed more than 1,500 college students on the specific type and frequency of adverse reactions they had experienced while using pot. Additionally, the students in the study were surveyed about their demographics, personality traits, reasons for using cannabis and their use patterns. </p><p>Despite marijuana's <a href="https://bigthink.com/sex-relationships/marijuana-sex" target="_self">numerous benefits</a>, the team identified a total of <a href="https://jcannabisresearch.biomedcentral.com/articles/10.1186/s42238-019-0013-x/tables/2" target="_blank">26 possible adverse reactions to</a> the drug. More than half of the study participants reported having coughing fits along with anxiety and/or paranoia while using cannabis. The most frequently occuring of these were the coughing fits, along with chest/lung discomfort and body humming. A subset of the study group reported these reactions occurring around 30–40% of the time they were using pot. On the flip side, the three <em>least</em>-commonly reported reactions to cannabis use were fainting, visual hallucinations and cold sweats. </p><p>"There's been surprisingly little research on the prevalence or frequency of various adverse reactions to cannabis and almost no research trying to predict who is more likely to experience these types of adverse reactions," <a href="https://news.wsu.edu/2020/03/30/new-research-sheds-light-potentially-negative-effects-cannabis/" target="_blank">said Carrie Cuttler</a>, assistant professor of psychology and an author on the paper, according to WSU News. "With the legalization of cannabis in Washington and 10 other states, we thought it would be important to document some of this information so that more novice users would have a better sense of what types of adverse reactions they may experience if they use cannabis."</p><p>The most distressing of the 26 negative reactions were panic attacks, fainting, and vomiting. Yet, the survey data suggested that cannabis users generally do not find even acute adverse reactions to cannabis to be severely distressing.</p>
What causes a bad reaction?<img type="lazy-image" data-runner-src="https://assets.rebelmouse.io/eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJpbWFnZSI6Imh0dHBzOi8vYXNzZXRzLnJibC5tcy8yMjkwOTEwOC9vcmlnaW4uanBnIiwiZXhwaXJlc19hdCI6MTYyNTQ5MDQ2Mn0.S2Pkbh3VAgB4Gk5tkavamMv0_4t76dg65yGWpCHG17U/img.jpg?width=1245&coordinates=0%2C1872%2C0%2C1252&height=700" id="dee45" class="rm-shortcode" data-rm-shortcode-id="df6e30ecae156ba0012f4773a374800c" data-rm-shortcode-name="rebelmouse-image" />
But most city dwellers weren't seeing the science — they were seeing something out of Blade Runner.
On Sept. 9, many West Coast residents looked out their windows and witnessed a post-apocalyptic landscape: silhouetted cars, buildings and people bathed in an overpowering orange light that looked like a jacked-up sunset.
A study finds 1.8 billion trees and shrubs in the Sahara desert.
- AI analysis of satellite images sees trees and shrubs where human eyes can't.
- At the western edge of the Sahara is more significant vegetation than previously suspected.
- Machine learning trained to recognize trees completed the detailed study in hours.
Why this matters<img type="lazy-image" data-runner-src="https://assets.rebelmouse.io/eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJpbWFnZSI6Imh0dHBzOi8vYXNzZXRzLnJibC5tcy8yNDU2MDQ1OC9vcmlnaW4uanBnIiwiZXhwaXJlc19hdCI6MTYzOTkyODg5NX0.O3S2DRTyAxh-JZqxGKj9KkC6ndZAloEh4hKhpcyeFDQ/img.jpg?width=980" id="3770d" class="rm-shortcode" data-rm-shortcode-id="3c27b79d4c0600fb6ebb82e650cabec0" data-rm-shortcode-name="rebelmouse-image" />
Area in which trees were located
Credit: University of Copenhagen<p>As important as trees are in fighting climate change, scientists need to know what trees there are, and where, and the study's finding represents a significant addition to the global tree inventory.</p><p>The vegetation Brandt and his colleagues have identified is in the Western Sahara, a region of about 1.3 million square kilometers that includes the desert, <a href="https://en.wikipedia.org/wiki/Sahel" target="_blank">the Sahel</a>, and the <a href="https://www.sciencedirect.com/topics/agricultural-and-biological-sciences/subhumid-zones" target="_blank" rel="noopener noreferrer">sub-humid zones</a> of West Africa.</p><p>These trees and shrubs have been left out of previous tabulations of carbon-processing worldwide forests. Says Brandt, "Trees outside of forested areas are usually not included in climate models, and we know very little about their carbon stocks. They are basically a white spot on maps and an unknown component in the global carbon cycle."</p><p>In addition to being valuable climate-change information, the research can help facilitate strategic development of the region in which the vegetation grows due to a greater understanding of local ecosystems.</p>
Trained for trees<img type="lazy-image" data-runner-src="https://assets.rebelmouse.io/eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJpbWFnZSI6Imh0dHBzOi8vYXNzZXRzLnJibC5tcy8yNDU2MDQ3MC9vcmlnaW4uanBnIiwiZXhwaXJlc19hdCI6MTYzNTk5NTI3NH0.fR-n1I2DHBIRPLvXv4g0PVM8ciZwSLWorBUUw2wc-Vk/img.jpg?width=980" id="e02c0" class="rm-shortcode" data-rm-shortcode-id="79955b13661dca8b6e19007935129af1" data-rm-shortcode-name="rebelmouse-image" />
Credit: Martin Brandt/University of Copenhagen<p>There's been an assumption that there's hardly enough vegetation outside of forested areas to be worth counting in areas such as this one. As a result the study represents the first time a significant number of trees — likely in the hundreds of millions when shrubs are subtracted from the overall figure — have been catalogued in the drylands region.</p><p>Members of the university's Department of Computer Science trained a machine-learning module to recognize trees by feeding it thousands of pictures of them. This training left the AI be capable of spotting trees in the tiny details of satellite images supplied by NASA. The task took the AI just hours — it would take a human years to perform an equivalent analysis.</p><p>"This technology has enormous potential when it comes to documenting changes on a global scale and ultimately, in contributing towards global climate goals," says co-author Christian Igel. "It is a motivation for us to develop this type of beneficial artificial intelligence."</p><p>"Indeed," says Brandt says, "I think it marks the beginning of a new scientific era."</p>
Looking ahead and beyond<p>The researchers hope to further refine their AI to provide a more detailed accounting of the trees it identifies in satellite photos.</p><p>The study's senior author, Rasmus Fensholt, says, "we are also interested in using satellites to determine tree species, as tree types are significant in relation to their value to local populations who use wood resources as part of their livelihoods. Trees and their fruit are consumed by both livestock and humans, and when preserved in the fields, trees have a positive effect on crop yields because they improve the balance of water and nutrients."</p><p>Ahead is an expansion of the team's tree hunt to a larger area of Africa, with the long-term goal being the creation of a more comprehensive and accurate global database of trees that grow beyond the boundaries of forests.</p>
Younger Americans support expanding the Supreme Court and serious political reforms, says new poll.