Solving Thought Problems Or Questions?

1. Solving Thought ProblemsOr Questions? Thought problems are question problems which ask you to explain a situation or a phenomena.

2. Solving Thought ProblemsOr Questions? Thought problems are question problems which ask you to explain a situation or a phenomena. One reads the problem, selects a law of physics and applies that law to solve the question.

3. Solving Questions Often that is not sufficient to solve the question, so one has to Read the question Over and Apply Reason. This is the ROAR process.

4. Solving Questions Often that is not sufficient to solve the question, so one has to Read the question Over and Apply Reason. This is the ROAR process. This involves asking the questions:

5. Solving Questions Often that is not sufficient to solve the question, so one has to Read the question Over and Apply Reason. This is the ROAR process. This involves asking the questions: What is the question trying to find?

6. Solving Questions Often that is not sufficient to solve the question, so one has to Read the question Over and Apply Reason. This is the ROAR process. This involves asking the questions: What is the question trying to find?What does the statement of the question mean?

7. ROAR What physical law can I use ?

8. ROAR What physical law can I use ? How would it apply to this problem?

9. ROAR What physical law can I use ? How would it apply to this problem? Have I ever experienced this?

10. ROAR What physical law can I use ? How would it apply to this problem? Have I ever experienced this? The law seems to apply to the problem, but there is a problem!

11. ROAR What physical law can I use ? How would it apply to this problem? Have I ever experienced this? The law seems to apply to the problem, but there is a problem! Can I solve that problem which arose?

12. Example Question Under what circumstances might something be weightless?

13. Example Question Under what circumstances might something be weightless? Question asks for the situations when an object might be weightless.

14. Example Question Under what circumstances might something be weightless? Question asks for the situations when an object might be weightless. Situation: I have never seen anything not have weight.

15. Example Question Under what circumstances might something be weightless? Question asks for the situations when an object might be weightless. Situation: I have never seen anything not have weight. The Law of Universal Gravitation says that all bodies have weight W = m g

16. Question Solving Continued. So how can an object have weight, but be weightless?

17. Question Solving Continued. So how can an object have weight, but be weightless? (New problem to solve)

18. Question Solving Continued. So how can an object have weight, but be weightless? (New problem to solve) Reasoning: Why do we feel weight ?

19. Question Solving Continued. So how can an object have weight, but be weightless? (New problem to solve) Reasoning: Why do we feel weight ? It is the force of the object against a surface. For example I feel weight because my feet are touching the ground.

20. Question Solving Continued. So how can an object have weight, but be weightless? (New problem to solve) Reasoning: Why do we feel weight ? It is the force of the object against a surface. For example I feel weight because my feet are touching the ground. How can I make my feet touch no surface?

21. Question Solving Continued Hmmm, let me think of an example of when I can’t feel something against my feet ?

22. Question Solving Continued Hmmm, let me think of an example of when I can’t feel something against my feet ? Oh yes, when I jump from a high place to a low place, when I’m falling I can’t feel any weight. Like when I’m jumping into the swimming pool, or diving.

23. Question Solving Continued Oh yes, I remember seeing the astronauts float around in space, certainly they are weightless.

24. Question Solving Continued Oh yes, I remember seeing the astronauts float around in space, certainly they are weightless. Yes I remember at camp, they used to throw us into the air from a large blanket I remember how I felt then… like I was floating in space.

25. Question Solving Continued Oh yes, I remember seeing the astronauts float around in space, certainly they are weightless. Yes I remember at camp, they used to throw us into the air from a large blanket I remember how I felt then… like I was floating in space. These last three examples are all answers!

26. SOLVING QUANTATITIVE PROBLEMS GURU CA METHOD

27. SOLVING QUANTATITIVE PROBLEMS GURU CA METHOD G Write Down the GIVENS ( Assign a symbol and unit for each value.)

28. SOLVING QUANTATITIVE PROBLEMS GURU CA METHOD G Write Down the GIVENS ( Assign a symbol and unit for each value.) U Write down the UNKNOWN (Assign a symbol and unit)

29. SOLVING QUANTATITIVE PROBLEMS GURU CA METHOD G Write Down the GIVENS ( Assign a symbol and unit for each value.) U Write down the UNKNOWN (Assign a symbol and unit) R Select a RELATIONSHIP (equation)

30. SOLVING QUANTATIVE PROBLEMS (Cont’d) U Determine if the UNITS desired can be directly determined from the givens. If not convert to the proper unit.

31. SOLVING QUANTATIVE PROBLEMS (Cont’d) U Determine if the UNITS desired can be directly determined from the givens. If not convert to the proper unit. C Substitute the values in the equation and CALCULATE the unknown.

32. SOLVING QUANTATIVE PROBLEMS (Cont’d) U Determine if the UNITS desired can be directly determined from the givens.If not convert to the proper unit. C Substitute the values in the equation and CALCULATE the unknown. A State the ANSWER with its unit.

33. EXAMPLE SOLVING A PROBLEM BY GURU CA As a 2 kg ball rolls down a ramp, the net force on it is 10 N. What is the acceleration ?

34. EXAMPLE SOLVING A PROBLEM BY GURU CA As a 2 kg ball rolls down a ramp, the net force on it is 10 N. What is the acceleration ? G m = 2 kg F = 10 N

35. EXAMPLE SOLVING A PROBLEM BY GURU CA As a 2 kg ball rolls down a ramp, the net force on it is 10 N. What is the acceleration ? G m = 2 kg F = 10 N U a = ? (m/s2)

36. EXAMPLE SOLVING A PROBLEM BY GURU CA As a 2 kg ball rolls down a ramp, the net force on it is 10 N. What is the acceleration ? G m = 2 kg F = 10 N U a = ? (m/s2) R a = F/m

37. EXAMPLE SOLVING A PROBLEM BY GURU CA As a 2 kg ball rolls down a ramp, the net force on it is 10 N. What is the acceleration ? G m = 2 kg U N/kg = m/s2 F = 10 N U a = ? (m/s2) R a = F/m

38. EXAMPLE SOLVING A PROBLEM BY GURU CA As a 2 kg ball rolls down a ramp, the net force on it is 10 N. What is the acceleration ? G m = 2 kg U N/kg = m/s2 F = 10 N U a = ? (m/s2) C a = 10 N/2 kg R a = F/m

39. EXAMPLE SOLVING A PROBLEM BY GURU CA As a 2 kg ball rolls down a ramp, the net force on it is 10 N. What is the acceleration ? G m = 2 kg U N/kg = m/s2 F = 10 N U a = ? (m/s2) C a = 10 N/2 kg R a = F/m A a = 5 m/s2

40. EXAMPLE SOLVING A PROBLEM BY GURU CA A child weighs 300 N. What is the child’s mass ?

41. EXAMPLE SOLVING A PROBLEM BY GURU CA A child weighs 300 N. What is the child’s mass ? G W = 300 N g = 9.8 m/s2

42. EXAMPLE SOLVING A PROBLEM BY GURU CA A child weighs 300 N. What is the child’s mass ? G W = 300 N g = 9.8 m/s2 U m = ? ( kg)

43. EXAMPLE SOLVING A PROBLEM BY GURU CA A child weighs 300 N. What is the child’s mass ? G W = 300 N g = 9.8 m/s2 U m = ? ( kg) R m = W/g

44. EXAMPLE SOLVING A PROBLEM BY GURU CA A child weighs 300 N. What is the child’s mass ? G W = 300 N U N/m/s2 = kg g = 9.8 m/s2 U m = ? ( kg) R m = W/g

45. EXAMPLE SOLVING A PROBLEM BY GURU CA A child weighs 300 N. What is the child’s mass ? G W = 300 N U N/m/s2 = kg g = 9.8 m/s2 U m = ? ( kg) C m = 300 N/9.8 m/s2 R m = W/g

46. EXAMPLE SOLVING A PROBLEM BY GURU CA A child weighs 300 N. What is the child’s mass ? G W = 300 N U N/m/s2 = kg g = 9.8 m/s2 U m = ? ( kg) C m = 300 N/9.8 m/s2 R m = W/g A m = 30.6 kg