Galileo Galilei's Concept of Free-fall.pptx

a presentation that discusses about the concept of free-fall

1. FREE-FALLING BODIES JEROME R. TABADERO

2. 2 FREE-FALL |

3. ACTIVITY 3

4. ACTIVITY 5 Form three (3) groups. Each group will have their own materials: egg, a page of newspaper, scissor, 1 meter tape, and 1 meter yarn. Your Mission: CREATE A PARACHUTE FOR THE EGG! The egg (with the parachute) will be put on a drop test. The eggs will be dropped at the same time and from the same height. The group whose egg will not break will win. YOU HAVE 5 MINUTES!

5. DESCRIBE THE MOTION OF THE EGG WITH THE PARACHUTE. 6

6. HOW WILL THE EGG FALL IF THERE IS NO PARACHUTE? 7

7. FREE-FALL 8 At the end of the lesson, you should be able to : describe the motion of the falling objects; determine the factors that affect the object’s rate of fall; and solve problems related to free-fall.

8. Why do objects FALL down to earth?

9. GRAVITY T he force by which a body (like a planet) draws objects toward its center .  Sir Isaac Newton

10. Galileo Galilei Feb. 15, 1564 – Jan. 08, 1642 Pisa, Italy Astronomer, Physicist and Engineer

11. 12

12. FREE-FALL 13 Any motion of a body where gravity is the only force acting upon it. Neglect the air resistance, mass, size, and shape of the object.  

13. BALL vs PAPER: Which of the two will fall faster?

14. What will happen to the motion of a falling object if there is NO air around us?

15. “In the absence of air resistance, ALL BODIES FALL WITH THE SAME ACCELERATION , independent of their mass.” 16

16. VACUUM emptiness of space. a space absolutely devoid of matter 17

17. FREE-FALL 20 Pull of gravity Air resistance Mass Size Shape

18. FREE-FALL 21 Acceleration due to gravity = 9.8 m/s 2 a g

19. FREE-FALL Acceleration due to gravity a g = 9.8 m/s 2 22 Time (s) Speed (m/s) 1 9.8 2 19.6 3 29.4 4 39.2 5 49

20. How do we solve problems related to free-fall?

21.   24 FREE-FALL d = h where in: d = distance ; t = time ; a = acceleration ; v f = final velocity; and v i = initial velocity. Kinematics Equation:   where in: h = height ; t = time ; a g = acceleration due to gravity; v f = final velocity; and v i = initial velocity.

22. 25 FREE-FALL If the v i = 0   where in: h = height ; t = time ; a g = acceleration due to gravity;

23. SAMPLE PROBLEM #1 An object is dropped from rest from the top of a tall building. It hits the ground 5 seconds after it is dropped. What is the height of the building? 26 Given: t = 5 s a g = 9.8 m/s 2 h = ? Equation:  

24. SAMPLE PROBLEM #2 An object in free fall has an initial, downward velocity of 2 m/s and falls a distance of 45 m. What is the object’s final velocity? 27 Given: v i = 2 m/s a g = 9.8 m/s 2 h = 45 m v f = ? Equation:  

25. What is FREE-FALL? 28 FREE-FALL |

26. SKYDIVING 29

27. QUIZ I. Multiple Choice. Read and analyze each statement. Choose and write the correct answer on your paper. 30

28. QUIZ 1. In free-fall, what will happen to the velocity of a ball if we drop it? A. It will decrease at a uniform rate. B. It will remain the same. C. It will increase with a uniform rate. 31

29. QUIZ 2. The acceleration due to gravity that is experienced by falling objects on Earth is ______. A. 9.8 m/s B. 9.8 m/s 2 C. 9.8 m 2 /s 32

30. QUIZ 3.In free-fall, a 2-kg rock will fall faster than a 1-kg ball. A. True B. False 33

31. QUIZ 4. When we say that light objects and heavy objects fall at the same rate, what assumption are we making? A. They have the same shape. B. They are falling in a vacuum. C. They are made of the same material. D. They have the same size. 34

32. QUIZ 5. When an object is tossed upward, its velocity on its highest possible position is ___. A. B. 9.8 m/s C. 9.8 m/s2 . 35

33. QUIZ II. Problem Solving: An object was dropped from the top of a 150-meter-high building. How long before the object reaches the ground? 36

34. ASSIGNMENT Solve the problem by showing the given and your solution. Write your answer on a ½ sheet of paper. A juggler tosses three balls alternately vertically upward. Each ball has an initial velocity of 5 m/s. How high does each ball rise? How long does each ball remain in the air? 37