Friction+and+Gravity

**BY: R.HOLLAND61 & ZACH_3132**

Hey everyone welcome to the Friction and Gravity Wiki page. Today we will discuss different frictions and different types of gravity. We will have a cool Xtranormal video, we will have cool facts and pictures about friction and gravity, and we might have a comic off of toon doo too! So, enjoy this wiki, and lets talk about gravity and friction!

** Table of Contents ** Friction Friction Pictures Friction Xtranormal Video Air resistance Gravity Free Fall Toondoo Works Cited

Friction is used with everything in our life. If we didn't have friction, we might not be able to do alot of stuff we do today. There are four different kinds of friction. There is fluid, rolling, ​sliding, and static frictions. Fluid friction is when an object pushes a fluid and pushes it aside and causes friction. This happens when a surfer rides a wave. Also in the category of fluid friction is air resistance. That is when an object falls through the air and fluid friction occurs. Rolling friction occurs when an object rolls over a surface, like a skateboard on a ramp. Sliding friction occurs when an object slides over a surface, such as sliding with your socks on a wooden floor. And, static friction is friction that acts in the direction opposite to the motion intended.(Jones) Below are picture of rolling and fluid friction. ( Fluid friction is on top and rolling is on bottom.) media type="custom" key="6132101" Air resistance is a type of fluid friction that occurs when an object falls through the air.(Jones) Gravity ** Gravity is another thing that we use everyday. Without gravity, we would probably just float in the air. Thats why when people stand on the moon, they jump extra high because theres less gravity then here on earth. Gravity all has to do with weight and mass. What weight is, is the force of gravity on an object. See, gravity pushes downard on us. Thats why when we jump, we go straight down after a number of seconds. If there was no gravity at all, when we jump, we would stay in the air. The gravity pushes down on us, creating weight. Mass is also a big factor in gravity. The amount of matter in an object is mass. We all have matter inside us so, when gravity pushes down on us, our mass keeps us down. So, weight and mass is what keeps us down.(Jones) media type="custom" key="6132403"
 * Friction**
 * Air Resistance**


 * Work Cited **

Jones, T. //Motion, Forces, and Energy //. Upper Saddle River: Pearson, 2009. 42-29. Print. "Friction." //Xtranormal//. Web. 21 May 2010. . "Free Fall." //Toondoo//. Web. 21 May 2010. . "Kickflip Setup." //Z.About//. Web. 21 May 2010. < []>. "Surfer." //Thinkquest//. Web. 21 May 2010. .