Changing speed and direction

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Presentation transcript:

Changing speed and direction 1.3 Acceleration Changing speed and direction

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

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) speed Final (ending) speed Time for change in speed ACCEL. = FINAL SPEED-INITIAL SPEED ------------------------------------------- TIME

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.

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.

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)?

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