I’m always looking for stuff to analyze, and this is a great physics example. So now I get to do what I do: Using physics, I want to figure out how much (super) power Wonder Woman would need to hit that bullet in midair.Let’s start by looking at the upward motion of the bullet as it leaves the gun. If you’ve worked out movie scenes with me before (like the one where we analyzed Spider-Man’s leaps ), you know the drill. I use my favorite video analysis tool, Tracker, to mark the location of an object in each frame of the video and combine that with the frame rate to get position and time data. But this particular shot is a little tougher. Here are the problems:
- I need to know the size of something in the picture to fix a distance scale, and I don’t. The best I’ve got is the gun and Wonder Woman's hand, so we’ll have to estimate here.
- The camera zooms and pans during the shot, and we have to factor that out. I can use a stationary object like the wall behind Wonder Woman as a reference point, but it’s only an approximation, since the wall is farther away. Due to parallax , the change in apparent motion for this and the bullet will be slightly different.
- It’s not in real time. Clearly it would take a bullet less than 3 seconds to get to its highest point. I don't know the actual time between frames, and as we'll see below, it's not constant through the whole shot.