1.3 Acceleration

Changing speed and direction

What is Acceleration?Increasing SpeedDecreasing SpeedChanging 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

Did we understand that?Make a sketch of the three ways

an object can accelerate.

Calculating Acceleration

What do you think we will need to calculate the acceleration of an object?

Initial (starting) speedFinal (ending) speedTime for change in speed

ACCEL. = FINAL SPEED-INITIAL SPEED-------------------------------------------

TIME

Let’s PracticePlease 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.

Accelerating Marble

Challenge: To design track for a marble to travel on. The marble should:

Accelerate at least twiceDecelerate at least twiceChange directions at least onceDrop gently into a paper cup at

the end of the track.

How did it Accelerate?

1. Make a sketch of your marble track.

2. Label the track with:1. The areas of acceleration2. The areas of deceleration3. The area(s) of changing direction

3. What was the initial speed of the marble? How do you know?

4. Why did your track start with an area of acceleration (not deceleration)?

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.

Graphing AccelerationSpeed vs. Time Graph

ACCEL. = SPEED CHANGE/TIME

Slope = Rise/Run

Acceleration CaseDeceleration CaseNo Acceleration Case