As spring is starting to approach us, many kids want to get out and start riding their bikes. However, what some kids don't know is that riding a bike involves physics. When you are riding your bike, you start by going very slow; however, as you begin to pedal fast, you speed up, that's called acceleration. When you start traveling at normal speed, you don't have to continue pedaling as hard. This means that you're just traveling at a constant speed which means that you're not accelerating. Also, if you stop pedaling, the friction of the tires will start making you slow down and go slower. Therefore the next time you're riding your bike, you will know that acceleration and friction are involved!