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Day 59 Physics UCM

Day 59 Physics UCM. LO: SWBAT perform calculate Fc and Ac LO: SWBAT Calculate Fg using NULG AGENDA Do Now – Complete UCM worksheet Notes Worksheet HW22 due Thursday. Newton’s Law of Universal Gravitation. Sir Isaac Newton (1642-1727). 60R earth. R earth. Constant of proportionality.

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Day 59 Physics UCM

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  1. Day 59 Physics UCM LO: SWBAT perform calculate Fc and Ac LO: SWBAT Calculate Fg using NULG AGENDA Do Now – Complete UCM worksheet Notes Worksheet HW22 due Thursday

  2. Newton’s Law of Universal Gravitation

  3. Sir Isaac Newton (1642-1727)

  4. 60Rearth Rearth

  5. Constant of proportionality M1 M2 r Newton’s Law of Gravity

  6. Cavendish, Henry (1731-1810) • Measured G in 1798 G = 6.67 x 10-11 Nm2/kg2

  7. (3)(4) F = (6.67 x 10-11) 22 2 m 4 kg What is the force between Kiwi and a book? F = 2 x 10-10 N 3 Kg

  8. (3)(4) F = (6.67 x 10-11) 22 F cat, book F book, cat 4 kg What is the force between Kiwi and a book? 1,2 F = 2 x 10-10 N or?? 3 Kg

  9. (5.98 x 1024 kg) Mbook Wearth,book = (6.67 x 10-11Nm2) (6.38 x 106 m)2 kg2 r= 6.38 x 106 m What is the force between the Earth and a book? Wearth,book = Mbook(9.8 N/kg) Mearth = 5.98 x 1024 kg

  10. But you ask why is “g” independent of mass? • F = m1g = Gm1mearth/r2 • Note that the m1’s cancel on both sides and: • g = Gmearth/r2

  11. Storey Musgrave (6 SST missions and Hubble Repair)m = 80 kg

  12. What’s his mass?

  13. What’s his weight? 648 N !

  14. Apollo 17 Earth as seen from the Moon

  15. What is the correct orbit of the space shuttle?

  16. What is the correct orbit of the space shuttle?

  17. At the surface of the Earth: Wearth,Story = MStory(9.8 N/kg) = (80 kg) (9.8 N/kg) = 784 N rearth = 4000 miles

  18. 400 miles above the surface : Wearth,Story = MStory(8.1 N/kg) = (80 kg) (8.1 N/kg) = 648 N rearth = 4000 miles

  19. NFS NSP person scale WES WEP NPS Which force does the scale read? Apparent Weight True Weight

  20. Apparent weight • measured as the reading of the scale • equal to the normal force of the scale on your feet • equal to weight for a=0

  21. v = constant Apparent Weight NSP a = 0 WEP True Weight Elevator

  22. a is upward Apparent Weight NSP a WEP True Weight Elevator

  23. a is downward Apparent Weight NSP a WEP True Weight Elevator

  24. Problem • You are riding down in an elevator carrying a 20 kg package in your arms. As the elevator gets to your floor, it slows with an acceleration of 2 m/s/s. What is the apparent weight of the package while the elevator is slowing?

  25. a =9.8 m/s/s down NSP g WEP Elevator How large should the normal force be?

  26. g Elevator How large should the normal force be? a =9.8 m/s/s down Apparently Weightless?? WEP

  27. KC 135 INTERIOR

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