I was playing Mariokart DoubleDash this weekend, and I realized that it has a lot to do with centripetal force. It may not be real centripetal force since it is just a videogame, but anyways...Centripetal force is important when making turns. I noticed that I had to apply the brakes a lot to make it around some bends (see the sparks in the picture?). In this case, friction was the centripetal force. My cart would spin out when there wasn't enough friction. The centripetal force was also always directed inward. Mariokart DoubleDash even involves bouncy collisions because you get to throw shells and firebombs at other players. The mushrooms also make you accelerate :)