3. Why Do We Do Experiments?

5. To Learn Why Do We Do Experiments?

6. To Learn To discover new information Why Do We Do Experiments?

7. To Learn To discover new information To test an existing theory Why Do We Do Experiments?

8. To Learn To discover new information To test an existing theory Because our teacher tells us to! Why Do We Do Experiments?

9. To Learn To discover new information To test an existing theory Because our teacher tells us to! Why Do We Do Experiments?

10. Practical Uses For Experiments

11. To test the safety of new medicines

12. Practical Uses For Experiments To test the safety of new medicines To invent new products

13. Practical Uses For Experiments To test the safety of new medicines To invent new products To get a good grade in science

14. Practical Uses For Experiments To test the safety of new medicines To invent new products To get a good grade in science ?

15. Is It important for scientists to follow a plan when doing experiments?

17. Why?

18. So you can trust the results

19. They should be Valid

20. So you can trust the results They should be Valid and

21. So you can trust the results They should be Valid and Replicable

22. A Quick Experiment

23. Which Life Saver has the best flavor?

24. A Quick Experiment Which Life Saver has the best flavor? Do you trust these results?

25. Another Quick Experiment

26. Which Sports Car is faster? How can we test this?

27. Let’s Race

28. Trial # 1

31. Trial # 2

34. Trial # 3

37. Which was the fastest car?

38. Which car got better?

39. Which was the fastest car? Which car got better? Which car got worse?

40. Which car got better? Which was the fastest car?

41. Steps to a Science Project: Question or Problem Library Research Hypothesis Design Experiment Conduct Experiment Record Data & Make Observations Draw Conclusions

42. The Four Question Strategy: 4. How can I measure the response of sports cars to the change? 3. How can I change the materials to affect the action of sports cars? 2. How do sports cars act? 1. What materials can we use to test sports cars?

43. Parts of an Experiment Variables: Things that change in an experiment Independent Variable: I change the I.V. Levels of the Independent Variable Dependent Variable: It changes and “depends” on what you change. What about things that could change, but shouldn’t?

44. Constants: The weight is the same. The tires are the same. The engine is the same. The car is the same! Parts of an Experiment

45. Do you remember the parts of an Experiment?

46. Parts of an Experiment Variables: Independent Variable Levels of the I.V.

47. Parts of an Experiment Dependent Variable Variables: Independent Variable Levels of the I.V.

48. Parts of an Experiment Constants Variables: Independent Variable Levels of the I.V. Dependent Variable

49. Parts of an Experiment Constants Variables: Independent Variable Levels of the I.V. Control (or Standard) Dependent Variable

50. Parts of an Experiment Constants Variables: Independent Variable Levels of the I.V. Repeated Trials Control (or Standard) Dependent Variable

51. Experimental Design Diagram