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# 2 air resistance

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### 2 air resistance

1. 1. Air Resistance
2. 2. <ul><li>If only gravity is present, all objects accelerate at 9.8 m/s 2 </li></ul><ul><li>Air resistance- the force air exerts on a moving object. This force acts in the opposite direction to the object’s motion. Air resistance pushes up as gravity pulls an object down. </li></ul>
3. 3. <ul><li>Ex: The larger the surface area of objects, the greater amount of air resistance on it. This is why a leaf falls more slowly than an acorn. </li></ul><ul><li>Terminal Velocity- the highest velocity that will be reached by a falling object. </li></ul>
4. 4. <ul><li>Ex: As an object falls through the air, air resistance gradually increases until it balances the pull of gravity. When this happens, the falling object will stop accelerating. This is the terminal velocity. </li></ul>
5. 5. <ul><li>Falling Object Equation #1 </li></ul><ul><li>Variable Ending Units </li></ul><ul><li>d= distance meters (m) </li></ul><ul><li>a= acceleration m/s 2 </li></ul><ul><li>t= time seconds </li></ul>
6. 6. <ul><li>Falling Object Equation #1 </li></ul><ul><li>d = ½ at 2 </li></ul>
7. 7. <ul><li>Falling Object Equation #2 </li></ul><ul><li>Variable Ending Units </li></ul><ul><li>v= velocity m/s </li></ul><ul><li>a= acceleration m/s 2 </li></ul><ul><li>t= time seconds </li></ul>
8. 8. <ul><li>Falling Objects Equation #2 </li></ul><ul><li>v= a X t </li></ul><ul><li>a= v / t </li></ul><ul><li>t= v / a </li></ul>v . . . . X a t