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# Acceleration

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### Acceleration

1. 1. Acceleration<br />
2. 2. Change in Velocity<br />Each time you take a step you are changing the velocity of your body.<br />You are probably most familiar with the velocity changes of a moving bus or car.<br />The rate at which velocity (speed or direction) changes occur is called acceleration.<br />
3. 3. Acceleration= final velocity- starting velocity<br /> time<br /> Change in velocity = final – starting velocity velocity<br /> Acceleration= change in velocity<br /> time<br />
4. 4. A car traveling at 60 mph accelerates to<br />90 mph in 3 seconds. What is the<br />car’s acceleration?<br />Velocity(final) - Velocity(original)<br />=<br />Acceleration<br />time<br />90 mph - 60 mph<br />=<br />3 seconds<br />30 mph<br />=<br />3 seconds<br />=<br />10 mph/second<br />
5. 5. Positive acceleration<br />Negative acceleration<br />
6. 6. A car traveling at 60 mph slams on the breaks to <br />avoid hitting a deer. The car comes to a safe stop <br />6 seconds after applying the breaks. What is the<br />car’s acceleration?<br />Velocity(final) - Velocity(original)<br />=<br />Acceleration<br />time<br />0 mph - 60 mph<br />=<br />6 seconds<br />- 60 mph<br />=<br />6 seconds<br />=<br />- 10 miles per hour per second<br />
7. 7. - A constant acceleration produces a straight line or linear slope (rise/run). - The slope of a non-linear velocity-time graph (rise/run) will predict an objects instantaneous acceleration. a = v/t<br />
8. 8. Free fall<br />The constant acceleration of an object moving only under the force of gravity is "g". <br />The acceleration caused by gravity is 10 m/s2<br />If there was no air, all objects would fall at the same speed<br />Doesn’t depend on mass<br />After 1 second falling at 10 m/s<br />After 2 seconds 20 m/s<br />3 seconds 30 m/s<br />
9. 9. Falling<br />Air resistance will increase as it falls faster<br />An upward force on the object<br />Eventually gravity will balance with air resistance<br />Reaches terminal velocity - highest speed reached by a falling object.<br />
10. 10. Terminal velocity<br />Force of gravity is constant<br /><ul><li> air resistance increases as you speed up
11. 11. until the force is equal
12. 12. Equal forces, no acceleration
13. 13. constant velocity terminal velocity</li></li></ul><li>Balloon Racers<br />What will happen if I let go of the blown up balloon?<br />Why did that happen?<br />How can we measure the speed, distance or acceleration of the balloon?<br />A track?<br />Attach the balloon to something?<br />