As you can see, this is a picture of me going down the slip and slide.  In order for me to slide all the way down, it is necessary for me to overcome a force called friction.  Frictional force is force that opposes motion or impending motion.  Frictional force is often the unbalanced force in Newton's first law.  If there was no friction on the slip and slide, I would keep sliding forever.  We were able to overcome this force by wetting the slip and slide, covering it with soap, and taking a running start.  Following Newton's second law, the faster I run before hitting the slide, the faster I will accelerate.  Newton's second law also states that mass is inversely proportional to acceleration, so if I was lighter yet still running at the same speed I would accelerate more.  After getting off the slide, I found that my belly was a little sore where I had hit the ground.  This is because of Newton's third law.  For every force there is an equal and opposite force.  When my stomach hit the ground, the ground hit my stomach back.