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# 12 1 Friction And Gravity

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### 12 1 Friction And Gravity

1. 1. Friction 12-1 Friction
2. 2. Friction = <ul><li>A force that opposes motion of objects that touches as they move past each other  </li></ul><ul><li>--All objects are affected by friction  </li></ul><ul><li>--If there were no friction = </li></ul><ul><li>It would be more slippery than ice </li></ul><ul><li>Ex. Food would fall off forks  </li></ul><ul><li>Ex. Walking will be impossible  </li></ul><ul><li>Ex. Cars will slide around and spin </li></ul>
3. 3. Friction <ul><li>Friction Acts on Surfaces that are in contact </li></ul><ul><li>--Direct Contact  </li></ul><ul><li>--Liquid and gas are included </li></ul>
4. 4. 4 types of Friction <ul><li>Static Friction : </li></ul><ul><li>Sliding Friction : </li></ul><ul><li>Rolling Friction : </li></ul><ul><li>Fluid Friction : </li></ul>
5. 5. Types of Friction: Static Friction : <ul><li>--Acts on objects not moving </li></ul><ul><li>--Acts opposite the applied force </li></ul><ul><li>EX. </li></ul><ul><li>Step  Foot does not slip when you put it down </li></ul><ul><li>--A lot of force needed to overcome </li></ul>
6. 6. Sliding Friction : <ul><li>-- Is a force that opposes the direction of motion of an object as it is sliding over the surface </li></ul><ul><li>--Small force needed to keep the object moving </li></ul>
7. 7. Rolling Friction : <ul><li>-- 100 to 1000X less force than static or sliding friction needed </li></ul><ul><li>--Rolling an object—the round object and the floor are bent slightly out of shape — </li></ul><ul><li>Less contact with floor— </li></ul><ul><li>Less friction </li></ul>
8. 8. Fluid Friction : <ul><li>Friction on an object that moves through the air or liquid that resists its movement </li></ul><ul><li>Ex. Air resistance = drag </li></ul><ul><li>Ex. Water resistance </li></ul>
9. 9. Gravity
10. 10. GRAVITY <ul><li>Gravity is a force that acts between any two masses </li></ul><ul><li>Is an attractive force </li></ul><ul><li>It pulls objects together </li></ul><ul><li>It does not require direct contact </li></ul><ul><li>Can work over large distances </li></ul>
11. 11. GRAVITY <ul><li>Earth’s Gravity Pulls objects toward the center </li></ul><ul><li>Falling objects have 2 forces working on them </li></ul><ul><li>1. Gravity </li></ul><ul><li>2. Air resistance </li></ul><ul><li>Gravity Accelerates objects, objects speed up when falling </li></ul><ul><li>Air Resistance slows objects down </li></ul>
12. 12. Terminal Velocity <ul><li>When gravity and resistance are equal it is called that Terminal Velocity </li></ul><ul><li>Terminal Velocity = A falling object constant speed = force of gravity </li></ul><ul><li>Projectile motion = A falling object after it has been given forward velocity </li></ul>
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