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### 09

1. 1. Warm-up, 09.08.2009<br />Name one important physicist and any of their achievements. Why is physics something we should all be aware of?<br />Nombre un físico importante y a cualquiera de sus logros. ¿Por qué está la física algo que nosotros deben toda ser consciente de?<br />Nommez un physicien important et n&apos;importe lequel de leurs accomplissements. Pourquoi la physique quelque chose que nous est-elle devrait tout se rendre compte de ?<br />
2. 2. Motion Ch. 3 S 2 - Acceleration<br />
3. 3. Acceleration – The change in velocity divided by the time it took for that change to occur<br />Review: What is Velocity?<br />Basically, this means the change in speeds divided by the time…..-OR – <br />Average acceleration =<br />(Vf-Vi)/(Time)<br />Ex: Lamborghini’s are known for their speed and record setting acceleration. These lamborghini’s accel to 60 miles per hour (100km/h) in 3.4 seconds!! <br />Can you calculate their average acceleration in METERS/second?<br />
4. 4. Incredible Hulk Vs. A LAMBO!<br />The Incredible Hulk accelerates to 40 miles per hour ( 62 km/h) in 2 seconds. <br />What is its average acceleration? <br />Compare this with the lamborghini’s acceleration and tell me who has the faster acceleration.<br />
5. 5. Calculating Positive and Negative Acceleration<br />If the slope is Negative, then the acceleration is decreasing. This means the object is slowing down.<br />If the slope is positive, then the acceleration is positive. This means the object is speeding up.<br />If the slope is zero, then the speed is not changing. The object is going at a constant speed<br />Distance (Meters)<br />40<br />20<br />10<br />40<br />20<br />30<br />Time (minutes)<br />
6. 6. Calculations =( Sorry for all the math…….<br />Ex: Calculating NEGATIVE acceleration (A.K.A. DEcelleration:<br />Mr.B is skateboarding down a ramp and she is cruising at a cool 14 miles per hour. Then, when he goes up the ramp, he falls over and comes to a stop in 2 seconds. What is his Deceleration? <br />
7. 7. Chapter 3 Section 3<br />Forces!!!<br />
8. 8. What are forces?<br />(I am not talking about shoes =)<br />A force is a push or pull that one object exerts on another.<br />Net Force – The TOTAL amount of force on an object.<br />Balanced Vs. Unbalanced Forces<br />Balanced - when the net force is equal to zero<br />Unbalanced – when the net force is NOT equal to zero.<br />See this stuff is EEEAASSSYYYY!<br />
9. 9. To Recap:<br />Acceleration: (final velocity in meters per second) - (initial velocity in meters per second) / (final time - initial time)<br />(Vf-Vi)/(Time)<br />An accelerating object is a POSITIVE number<br />Deceleration: The same equation as acceleration, but the result will be a NEGATIVE number.<br />Force: a push or pull.<br />Two or more forces acting on an object create a Net Force.<br />Balanced forces: net force is = 0<br />Unbalanced force: net force is NOT = 0<br />
10. 10. To recap:<br />Friction: the force that slows down, stops, or prevents two objects in contact from sliding forever.<br />Static friction: When friction &gt; the force trying to move it.<br />Sliding friction: the force of friction moving in the opposite direction of the object moving.<br />Air Resistance: Friction caused by air on falling objects.<br />