Describing Motion - acceleration Grade 9.pptx

Powerpoint for accelerration

1. Describing Motion (Acceleration)

2. Learning Objectives: 2 Define Acceleration Differentiate acceleration from speed and velocity Determine the SI units used in acceleration Solve worded problems related to acceleration. Relate the topic to their daily lives.

3. How will you differentiate Speed from velocity? 3

4. Cite examples that will show the speed and velocity of the moving objects. 4

5. What did you noticed on the GIFs I’ve shown to you in terms of speed and velocity?

6. Describing Motion (Acceleration)

7. Acceleration is a vector quantity. Depending on the reference point, a positive or negative acceleration indicates the direction of acceleration. A positive acceleration would also mean that the object changes its speed from a smaller value to a higher value such as a car starting to move from rest.

8. Acceleration A negative acceleration or deceleration would also mean that the object changes its speed from a higher value to a smaller value such as a moving car that is brought to a stop. Formula:   SI unit:  

9. 10 Directions: Solve the following worded problem in acceleration. Practice Problem (example) A car starts from a stoplight and is traveling with a velocity of 10 m/sec east in 20 seconds. What is the acceleration of the car?

10. 11 The Winner Takes it All (By pair) Solution Given: =10 m/s =0 m/s = 20 s   Formula:     The acceleration of the car is . Solution

11. 12 Directions: Solve the following worded problem in acceleration. Practice Problem A ball rolls down a ramp for 15 seconds. If the initial velocity of the ball was 1 m/sec and the final velocity was 16 m/sec, what was the acceleration of the ball ?

12. 13 Directions: Solve the following worded problem in acceleration. Practice Problem A meteoroid changed velocity from 1 km/s to 7 km/s in 2 seconds. What is the acceleration of the meteoroid?

13. 14 The Winner Takes it All (By pair) Solution Given: =16 m/s =1 m/s = 15 s   Formula:     The acceleration of the rolling ball is . Solution

14. 15 The Winner Takes it All (By pair) Solution Given: =7 m/s =1 km/s = 2 s   Formula:     The acceleration of the car is . Solution

15. Accelerating or not? 16

16. 17 Study the following diagrams, pictures, and GIFs and identify whether the following objects is accelerating or not.

17. How is acceleration important to our lives? 28

18. Generalization! 29

19. 30 Problem Solving Directions: Solve the following worded problem in acceleration. The space shuttle releases a space telescope into orbit around the earth. The telescope goes from being stationary to traveling at a speed of 1700 m/s in 17 seconds. What is the acceleration of the satellite?

20. 31 A ball is rolled at a velocity of 72 m/sec. After 36 seconds, it comes to a stop. What is the acceleration of the ball? A dragster in a race accelerated from stop to 60 m/s by the time it reached the finish line. The dragster moved in a straight line and traveled from the starting line to the finish line in 10 sec. What was the acceleration of the dragster?

21. Assignment:   How do you change the acceleration of the falling objects?

22. Thank You! 33