video analysis

There are three forces acting on the debris. First, there's the downward-pulling gravitational force (Fg) due to the interaction with the Earth. This force depends on both the mass (m) of…

Let’s say you don’t need to fly quite so far. What about a jet engine? These are the things you mainly see on commercial airliners, but very small jet engines can also be used to make a…

In this case, water starts from a source that's higher than the pump. (That's important.) As this input water moves down from the source, it increases in speed and goes out the waste valve.…

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…

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…

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…

Really, the only difference is that this is a downward-curving path with the center of this circular curve below the slide instead of above. (Once again, the gray C-shape represents the path…

Superheroes do superhero things: They jump, punch stuff, run fast, and sometimes shoot beams out of their eyes. These activities require energy, just like normal human activities. When you…

Everyone has the same comment about Batman: He's cool because he's just a normal dude, but he's also a superhero. It’s true, he doesn't have superpowers. However, what he does have is a…

Since the velocity is defined as the time-rate of change of position, the slope of this plot should give the velocity. That puts this wave speed at 2.85 m/s, which is pretty close to the…