dot physics

No one wants to deal with that many interactions. Instead, in physics we treat the ball as one thing—and that's mostly fine. However, to make sure that other people understand what we are…

OK, a couple of quick points. This is just the surface temperature of the Earth. Since the light from the sun just hits the surface and the Earth radiates from the surface, this ignores any…

I'm a sucker for interesting online games that don't have a score or even a goal. In this case, it's a cartoon space simulator to promote the book What If? 2, by Randall Munroe, the author…

I’ve been in academics for more than 20 years as a member of the physics faculty at Southeastern Louisiana University in Hammond, Louisiana. Here, the department is small enough that all of…

A few weeks ago, Sports Illustrated tweeted this video of Golden State Warriors point guard Steph Curry that instantly went viral. It shows him taking a shot at the basket—from the far side…

Another unit is the bar, where 1 bar is equal to 14.5 psi. The value of 1 bar is very close to the pressure of air on Earth. The atmospheric pressure of the air that surrounds you right now…

While it would be awesome for people to be able to live in space, a "weightless" environment poses some serious challenges. Humans function best on Earth’s surface, where they are affected…

But you don't have to be a superhero to experience this kind of flight. If you have a set of carbon-fiber wings and four engines, you can fly like Yves Rossy, also known as “Jetman.”Flying…

There are a couple of things to notice. First, after the collision DART is moving backwards, because it bounced. Since velocity is a vector, that means that it will have a negative momentum…

Now, what if I move outside this sphere? It turns out that the gravitational field due to a spherical distribution produces the same gravitational field as if all the mass was concentrated…