Acceleration refers to the process of an object changing its speed, whether by increasing or decreasing speed, or changing direction. An object accelerates when its speed increases over time. An object also accelerates when its speed decreases, called deceleration or negative acceleration. Even objects moving at a constant speed accelerate if they change direction, like seats on a Ferris wheel. To calculate acceleration, you determine the change in speed over a period of time, with acceleration measured in meters per second squared.

1. ACCELERATION MADE BY : ZEYAD BEDIR 7-D

2. What we will take about ? What is acceleration . Increasing speed . Decreasing speed .. Change direction . Calculating acceleration .

3. What is acceleration ? Acceleration means (( the process of speeding up )) .

4. Increasing speed Whenever an object’s speed increasing , the object accelerates

5. Decreasing speed Just an object can speed up , they can also slow down . This change in speed is sometimes called ((DECELERATES )) , or (( NEGATIVE ACCELERATION)) .

6. CHANGE DIRECTION Even that object that is traveling at a constant speed can be acceleration . Re call that acceleration can be change in direction as well as a change in speed . Many objects continuously change direction without change speed . For example : the seats on a Ferris wheel acceleration because they move in a circle .

7. Calculating acceleration To determine the acceleration of an object moving in a straight line , you must calculate the change in speed per unit of time . Acceleration = final speed – initial speed ----------------------------------- Time Acceleration is meters per second per second , or m . 2

8. THE END 7 - D MADE BY :ZEYAD BEDIR

9. AFTER YOU SEE THIS BE READY FOR ANY TEST WILL CAME IN THIS SECTION .