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Acceleration notes
- 1. Good Morning Youmay sit anywhere in the FIRST THREE ROWS Today you will need: lab book, calculator, spiral, pen or pencil Please do now: get your lab book, get out your calculator or borrow one, get out something to write with
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- 3. DIY Science LabUsing the motion detector, the laptop, and the Logger Pro software, figure out a way to create the following four graphs by your own motion.
- 4. DIY Science LabBe sure to describe what motion you made in your lab book next to the corresponding graph!
- 5. Acceleration Acceleration achange in the velocity of an object Acceleration can be written as a formula a = Δ Δ v t
- 6. Acceleration A helpfulway to think of acceleration is to say “acceleration is how fast the velocity changes” What is velocity? speed with a direction
- 7. Velocity is aVector Quantity A Vector quantity is something that has both a magnitude (size) direction Is acceleration a vector quantity? YES! Speed is a SCALAR quantity – scalar quantities have only a size
- 8. Acceleration The factthat acceleration has both a speed and a direction component is important – it means that there are three ways an object can accelerate speed up slow down change direction Of course, an object can both speed up and change direction – or slow down and change direction
- 9. Acceleration and theMoving Man In the Moving Man simulation, we looked at the shape of graphs when the man was speeding up and slowing down. In physics, we use the phrase “positive acceleration” to mean an increase in speed What phrase we use for a decrease in speed? negative acceleration
- 10. Acceleration and FormulasWe’ve looked at ways to calculate acceleration using the formula
- 11. Acceleration Sample ProblemA car is traveling at a speed of 45 km/h and then increases its speed to 75 km/h. The change in velocity takes 6 seconds. What is the acceleration?
- 12. Acceleration and StrobePhotos We’ve used three methods to describe constant velocity: graphs formulas strobe photos Strobe Photos can be used to describe acceleration as well
- 13. Acceleration and StrobePhotos Predict what the strobe photos for a car accelerating to the left would look like on the flipchart
- 14. Acceleration and StrobePhotos Because speed is changing when a car positively accelerates, the distance between the cars will increase with each photo. REMEMBER: the photos are taken at equal time intervals, so this type of strobe shows a car traveling a greater and greater distance each second.
- 15. Motion and GraphsReview On your guided notes sheet (handout), predict what an automobile at rest would look like as a graph for: dist v time velocity v time acceleration v time
- 16. Motion and GraphsReview On your guided notes sheet (handout), predict what an automobile at a constant velocity would look like as a graph for: dist v time velocity v time acceleration v time
- 17. Motion and GraphsReview On your guided notes sheet (handout), predict what an automobile that is accelerating would look like as a graph for: dist v time velocity v time acceleration v time