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IB Physics

IB Physics. Folders, text books, calculators. Paper 1 (Multiple Choice) Paper 2 (Extended response- some choice) Paper 3 (Options) Coursework SL-40 hours HL-60 hours. Let’s have a ball!. Topic 1 – Physics and physical measurement.

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IB Physics

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  1. IB Physics

  2. Folders, text books, calculators

  3. Paper 1 (Multiple Choice) • Paper 2 (Extended response- some choice) • Paper 3 (Options) • Coursework SL-40 hours HL-60 hours

  4. Let’s have a ball!

  5. Topic 1 – Physics and physical measurement Use the syllabus particularly when studying for examinations

  6. Ranges of sizes, masses and times

  7. Order of magnitude We can express small and large numbers using exponential notation The number of atoms in 12g of carbon is approximately 600000000000000000000000 This can be written as 6 x 1023

  8. Order of magnitude We can say to the nearest order of magnitude that the number of atoms in 12g of carbon is 1024 (6 x 1023 is 1 x 1024 to one significant figure)

  9. Small numbers Similarly the length of a virus is 2.3 x 10-8 m. We can say to the nearest order of magnitude the length of a virus is 10-8 m.

  10. Ranges of sizes, masses and times You need to have an idea of the ranges of sizes, masses and times that occur in the universe.

  11. Size On your paper can you write in order of decreasing size the names of 5 very small things.

  12. Size Which is the smallest? What size is it to the nearest order of magnitude?

  13. Size The smallest objects that you need to consider in IB physics are subatomic particles (protons and neutrons). These have a size (to the nearest order of magnitude) of 10-15 m.

  14. Size On your paper can you write in order of increasing size the names of 5 very large things.

  15. Size Which is the largest? How large is it to the nearest order of magnitude?

  16. Size The largest object that you need to consider in IB physics is the Universe. The Universe has a size (to the nearest order of magnitude) of 1025 m.

  17. Mass On your paper can you estimate the masses of the 5 smallest objects you wrote down earlier.

  18. Mass What do you think the mass of the electron is? 10-30 kg! (0.000000000000000000000000000001 kg)

  19. Mass We have already decided that the Universe is the largest object. What do you think its mass is? 1050 kg (100000000000000000000000000000000000000000000000000 kg)

  20. Time Now think of 5 small time intervals (For example, the time it takes sound to travel 1 metre is a small time interval. Can you think of smaller?)

  21. Time Can you add order of magnitude estimates for your time intervals? (For example, the time it takes sound to travel 1 metre is 10-3 seconds to the nearest order of magnitude)

  22. Time The smallest time interval you need to know is the time it takes light to travel across a nucleus. Can you estimate it? 10-23 seconds

  23. Time What’s the longest time interval you can think of?

  24. Time The age of the universe. Any ideas?

  25. Time The age of the universe. 1018 seconds

  26. Copy please! Size 10-15 m to 1025 m (subatomic particles to the extent of the visible universe) Mass 10-30 kg to 1050 kg (electron to the mass of the Universe) Time 10-23 s to 1018 s (time for light to cross a nucleus to the age of the Universe)

  27. A common ratio – Learn this! Hydrogen atom ≈ 10-10 m Proton ≈ 10-15 m Ratio of diameter of a hydrogen atom to its nucleus = 10-10/10-15 = 105

  28. Estimation For IB you have to be able to make order of magnitude estimates.

  29. Estimation/Guess What’s the difference?

  30. Estimate the following: (to the nearest order of magnitude) • The mass of an apple

  31. Estimate the following: (to the nearest order of magnitude) • The mass of an apple • The number of times a human heart beats in a lifetime.

  32. Estimate the following: (to the nearest order of magnitude) • The mass of an apple • The number of times a human heart beats in a lifetime. • The speed a cockroach can run.

  33. Estimate the following: (to the nearest order of magnitude) • The mass of an apple • The number of times a human heart beats in a lifetime. • The speed a cockroach can run. • The number of times the earth will fit into the sun (Rs = 6.96 x 108, Re = 6.35 x 106)

  34. Estimate the following: (to the nearest order of magnitude) • The mass of an apple • The number of times a human heart beats in a lifetime. • The speed a cockroach can run. • The number of times the earth will fit into the sun (Rs = 6.96 x 108, Re = 6.35 x 106) • The number of classrooms full of tea Mr Porter will drink in his lifetime.

  35. Estimate the following: (to the nearest order of magnitude) • The mass of an apple 10-1 kg • The number of times a human heart beats in a lifetime. • The speed a cockroach can run. • The number of times the earth will fit into the sun (Rs = 6.96 x 108, Re = 6.35 x 106) • The number of classrooms full of tea Mr Porter will drink in his lifetime.

  36. Estimate the following: (to the nearest order of magnitude) • The mass of an apple 10-1 kg • The number of times a human heart beats in a lifetime. 70x60x24x365x70=109 • The speed a cockroach can run. • The number of times the earth will fit into the sun (Rs = 6.96 x 108, Re = 6.35 x 106) • The number of classrooms full of tea Mr Porter will drink in his lifetime.

  37. Estimate the following: (to the nearest order of magnitude) • The mass of an apple 10-1 kg • The number of times a human heart beats in a lifetime. 70x60x24x365x70=109 • The speed a cockroach can run. 100 m/s • The number of times the earth will fit into the sun (Rs = 6.96 x 108, Re = 6.35 x 106) • The number of classrooms full of tea Mr Porter will drink in his lifetime.

  38. Estimate the following: (to the nearest order of magnitude) • The mass of an apple 10-1 kg • The number of times a human heart beats in a lifetime. 70x60x24x365x70=109 • The speed a cockroach can run. 100 m/s • The number of times the earth will fit into the sun (6.96 x 108)3/(6.35 x 106)3 = 106 • The number of classrooms full of tea Mr Porter will drink in his lifetime.

  39. Estimate the following: (to the nearest order of magnitude) • The mass of an apple 10-1 kg • The number of times a human heart beats in a lifetime. 70x60x24x365x70=109 • The speed a cockroach can run. 100 m/s • The number of times the earth will fit into the sun (6.96 x 108)3/(6.35 x 106)3 = 106 • The number of classrooms full of tea Mr Porter will drink in his lifetime.

  40. Let’s do some more estimating!

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