A few months ago my friends and I went paintballing! It was the first time I went so I didn't know what I was in for. Paintballing encompasses a lot of physics concepts. One example is a projectile. After the paintballs are shot at a high velocity from the gun, the only force acting upon them is gravity. This causes the paintballs to accelerate at negative 9.8 meters per second squared. Because the paintballs are shot at high velocity, it hurts sooo bad when you get hit (especially when you aren't wearing the proper hardcore paintballing gear). Another the physics concept which I happened to perform was the law of inertia: an object at motion stays at motion unless a net force acts upon it. I was running at a constant speed from one big inflatable shield thing to the next not really paying attention to where I was going (because I was watching for any paintballs that might come flying at me) and I ran straight into my friend. She was the net force that caused me (the object in motion) to stop. We both felt pretty stupid after that. Paintballing was a lot of fun but I got some pretty mean battle wounds. (This picture was taken before we got covered in paint, mud, and bruises).