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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

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**Newton’s Law of Universal Gravitation**

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Sir Isaac Newton ( )

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Rearth 60Rearth

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**Newton’s Law of Gravity**

Constant of proportionality M1 M2 r

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**Cavendish, Henry (1731-1810) Measured G in 1798**

G = 6.67 x Nm2/kg2

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**What is the force between Kiwi and a book?**

F = (6.67 x 10-11) (3)(4) 22 F = 2 x N 2 m 4 kg 3 Kg

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**What is the force between Kiwi and a book?**

1,2 F = (6.67 x 10-11) (3)(4) 22 F = 2 x N or ?? F cat, book F book, cat 4 kg 3 Kg

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**What is the force between the Earth and a book?**

Wearth,book = Mbook (9.8 N/kg) Wearth,book = (6.67 x 10-11Nm2) (5.98 x 1024 kg) Mbook (6.38 x 106 m)2 kg2 r = 6.38 x 106 m Mearth = 5.98 x 1024 kg

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**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

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

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What’s his mass?

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What’s his weight? 648 N !

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Apollo 17 Earth as seen from the Moon

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**What is the correct orbit of the space shuttle?**

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**What is the correct orbit of the space shuttle?**

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**At the surface of the Earth:**

Wearth,Story = MStory (9.8 N/kg) = (80 kg) (9.8 N/kg) = 784 N rearth = 4000 miles

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**400 miles above the surface :**

Wearth,Story = MStory (8.1 N/kg) = (80 kg) (8.1 N/kg) = 648 N rearth = 4000 miles

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**Which force does the scale read?**

NFS WES NPS scale WEP NSP person Apparent Weight True Weight

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**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

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

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Elevator NSP a is upward a Apparent Weight True Weight WEP

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Elevator a is downward a Apparent Weight True Weight NSP WEP

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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?

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

WEP

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**Elevator Apparently Weightless?? g**

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

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KC 135 INTERIOR

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Copyright Sautter 2003. Gravitation The Law of Universal Gravitation is based on the observed fact that all masses attract all other masses. The force.

Copyright Sautter 2003. Gravitation The Law of Universal Gravitation is based on the observed fact that all masses attract all other masses. The force.

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