1. Changing speed and direction
1.3 Acceleration
Changing speed and direction

2. What is Acceleration? Increasing Speed Decreasing Speed
Changing Direction
How can an object stay at the same speed yet still be accelerating?
Changing Directions at a constant speed requires acceleration move in the new direction

3. Did we understand that?
Make a sketch of the three ways an object can accelerate.

4. Calculating Acceleration
What do you think we will need to calculate the acceleration of an object?
Initial (starting) speed
Final (ending) speed
Time for change in speed
ACCEL. = FINAL SPEED-INITIAL SPEED
TIME

5. Let’s Practice Please do the two ‘Math Practice’ on page 25.
Another practice opportunity,
A badminton shuttlecock leaves the racquet traveling at 30 m/s. It goes over the net which is 5 meters away 0.5 seconds later with a speed of 10 m/s. Calculate its average acceleration.

6. Accelerating Marble
Challenge: To design track for a marble to travel on. The marble should:
Accelerate at least twice
Decelerate at least twice
Change directions at least once
Drop gently into a paper cup at the end of the track.

7. How did it Accelerate? Make a sketch of your marble track.
Label the track with:
The areas of acceleration
The areas of deceleration
The area(s) of changing direction
What was the initial speed of the marble? How do you know?
Why did your track start with an area of acceleration (not deceleration)?

8. Stopping on a Dime (p28-29)
Read through these two pages to get an idea of what this activity will ask us to do and why we are doing it.

9. Graphing Acceleration
Speed vs. Time Graph
ACCEL. = SPEED CHANGE/TIME
Slope = Rise/Run
Acceleration Case
Deceleration Case
No Acceleration Case