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Before Warm up Problem Go onto Turnitin.com and make sure you can log into the correct period Code/Password Period1 – 8549371 / JecaPhys1 Period 3 – 8549395 / JecaPhys3 Period 4 – 8549411 / JecaPhys4 Period 6 – 8549441 / JecaPhys6 Period 7 – 8554589 / JecaPhys7 Period 8 – 8554628 / JecaPhys8

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Warm up Problem A bus travels 280 km south along a straight path with an average velocity of 24.4 m/s to the south. The bus stops for 24 min, then it travels 210 km south with an average velocity of 20.8 m/s to the south. a. How long does the total trip last? b. What is the average velocity for the total trip?

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Physics Honors A & B – Day 9/10/13 & 9/11/13

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Agenda Acceleration? velocity v. time plots Kinematic equations examples

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What is acceleration?

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Acceleration

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Direction of acceleration will affect the magnitude and direction of velocity. Depending on Velocity vector, it could cause speeding up or slowing down.

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Acceleration Direction of acceleration will affect the magnitude and direction of velocity. Depending on Velocity vector, it could cause speeding up or slowing down.

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Acceleration Direction of acceleration will affect the magnitude and direction of velocity. Depending on Velocity vector, it could cause speeding up or slowing down.

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Acceleration Direction of acceleration will affect the magnitude and direction of velocity. Depending on Velocity vector, it could cause speeding up or slowing down.

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Acceleration +v and +a speed up +v and –a slow down -v and –a speed up -v and +aslow down v = 0 and + a speed up in direction of a v = 0 and –a speed up in direction of a + v and a = 0constant velocity (No change) -v and a = 0constant velocity (No change)

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Acceleration If velocity went on the y-axis And t went on the x- axis

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Velocity v. time plot

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So let’s look back How would you get from a Position v. time plot to acceleration v. time

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Calculate acceleration from Position v. time plot

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But we have word problems How are we going to solve the word problems we normally get?

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Kinematic Equations for constant acceleration

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Example A car accelerates uniformly from rest to a velocity of +23.7 m/s in 6.5 s. a) What was it’s acceleration? b) What was the car’s displacement? Draw a picture. Write down the given values. Write down what we are looking for. Write down the equation we need to use. Convert units. Manipulate equation. Input number with units. Calculate answer with correct units. Clearly mark answer.

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Example

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