1. 11-06-14 IPage 17 of ISN I can annotate a word problem and accurately calculate acceleration.

2. Acceleration

3. Acceleration is a CHANGE in motion An object is accelerating if it is: –Speeding up –Slowing down –Changing direction

4. Using an Accelerometer An accelerometer measures acceleration. CAREFULLY push your accelerometer so it slides across the table and comes to rest. How does the paper clip show acceleration? In your notebook, complete the chart for each situation.

5. Taking a ride on the school bus… YOU act like an accelerometer when you ride the school bus. What happens to you, when the bus: –Speeds up suddenly –Turns a corner –Stops quickly at a red light –Rides along at a steady speed

6. Taking a ride on the school bus… When your MOTION CHANGES, that’s a sign that the bus is ACCELERATING.

7. Is it accelerating? Your car speeds up when the light turns green. A racecar goes at a constant speed around a curved track. A toy car moves in a straight line across the room at a steady speed of 0.5 m/s. A roller coaster car slows down as it climbs a hill.

8. Graphing Acceleration On a position-time graph, changes in speed are shown by curved lines. Straight line – Not accelerating! Curving up – Speeding up Curving down – Slowing down

9. Look carefully at each car below. Decide which car matches graphs A, B, and C. Graph B – Constant Speed Graph C – Accelerating Slowly Graph A – Accelerating Quickly

10. Calculating Acceleration Acceleration is the change in speed per unit of time. Acceleration is measured in units of meters per second per second, or m/s 2. Acceleration = Final speed – Initial Speed Time

11. Calculating Acceleration A car leaving traffic changed its speed from 10 m/s to 25 m/s in 7.5 seconds. What was its acceleration? Acceleration = Final speed – Initial Speed Time Acceleration = 25 m/s – 10m/s 7.5 s = 2.0 m/s 2

12. USE PAGES 614-619 TO COMPLETE THE ACCELERATION WORKSHEET THIS IS AN INDEPENDENT ASSIGNMENT. Acceleration Worksheet