Here is a physics or math worksheet on wave pulse interaction. A lot of the examples of wave interactions were way too easy. A spot check visual could easily determine the results. I wanted to create a worksheet that would force them to solve it algebraically. It shows the moment when wave pulse x and wave pulse y are directly over each other. Wave X came from the left and is moving right with a speed of 1 unit per second. Wave Y came from the right and is moving left at a speed of 1 unit per second. The picture, which they must algebraically solve, shows when they meet and the students have to combine them.