Friction+and+Gravity+2

​​​Friction and Gravity 2 By Phillipe Dos Santos

**Friction​** **:** The Causes of Friction: The strength of the force of friction depends on two factors-how hard the surfaces push together and the types of surfaces involved. Static Friction: Static friction is when friction acts on objects that are not moving. Sliding Friction: Sliding friction occurs when two solid surfaces slide over each other. Rolling Friction:When an object rolls across a surface, rolling frictioon occurs. Fluid Friction: Fluid friction occurs when a soli object moves through a fluid.

Weight and Mass: Mass is a measure of the amount of matter in an object; Weight is a measure of the gravitational force exerted on an object. Universal Gravitation: Newton realized that gravity acts everywhere in the universe, not just on earth. Factors Affecting Gravity: Two factors affect the gravitational attraction between objects: mass and distance.
 * Gravity :**

Free Fall: In free fall, the force of gravity is an unbalenced force, which causes an object to accelerate. Air Resisternce: Objects falling through air experience a type of fluid friction called air resistence. Projectile Motion: An object that is thrown is called projectile motion.
 * Gravity and Motion :**

Roller Skates use rolling friction.

Bricks sliding in different directions is called sliding friction.​


 * Friction is a force that resists motion.

Gravity is a force which pushes you down,example: When you jump in the air, you quickly drop back to the ground. However how hard you throw a ball into the air, it always comes down again.**