1. P H Y S I C S Chapter 1: One-Dimensional Motion Section 1B: Acceleration Objectives: 1)We will calculate the acceleration of an object 2)We will list the three ways an object can accelerate

2. Acceleration Equation Change in velocity over time a  acceleration (m/s 2 ) v  final velocity (m/s) v o  initial velocity (m/s) t  time (s)

3. Acceleration Three ways:  Increase speed  Decrease speed  Change direction

4. Acceleration Positive  getting faster  a = +10 m/s 2 Negative  getting slower  a = -10 m/s 2 Zero  no change (constant)  a = 0 m/s 2

5. Usain Bolt (Olympic Sprinter)

6. Bolt vs. Gay vs. Powell Graph

7. Top Speed at 80 m Mark Determine the acceleration for Usain Bolt over the first 80 m of the race if he reaches his top speed of 12.42 m/s (27.78 mi/h) at a time of 7.92 s. a = 1.57 m/s 2

8. Faster than a Car? (BMW 320d) British Olympic Gold medalist Mark Lewis-Francis

10. Lewis-Francis vs. BMW 320d ∆xBMW 320dLewis-Francis 5 m1.5 s1.333 10 m2.3 s1.990 20 m3.3 s3.137 30 m4.0 s4.121 100 m7.5 s10.04 s RESULTS

11. In-Class Problem #1 A shuttle bus slows down with an average acceleration of -1.8 m/s 2. How long does it take the bus to slow from 9.0 m/s to a complete stop? t = 5.0 s

12. In-Class Problem #2 In a game of Mario Kart, Luigi is lagging behind Mario. Luigi accelerates at a rate of 3.0 m/s 2 for 1.5 s and reaches a speed of 14.0 m/s to pull past Mario. What was Luigi’s initial speed? v o = 9.5 m/s

13. Assignment Problem Set 1B 1A-1B Quiz (Displacement, Velocity & Acceleration Quiz)