Day 59 Physics UCM
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Transcript of Day 59 Physics UCM
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Day 59 Physics UCM
LO: SWBAT perform calculate Fc and AcLO: SWBAT Calculate Fg using NULG
AGENDADo Now – Complete UCM worksheetNotesWorksheetHW22 due Thursday
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Newton’s Law of Universal Gravitation
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Sir IsaacNewton
(1642-1727)
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Rearth
60Rearth
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221
r
MMGF
Newton’s Law of Newton’s Law of GravityGravity
M1 M2
r
Constant of proportionality
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Cavendish, Henry (1731-1810)
• Measured G in 1798
G = 6.67 x 10-11 Nm2/kg2
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What is the force between Kiwi and a book?
4 kg
F = (6.67 x 10-11)(3)(4)
22
F = 2 x 10-10 N
221
r
MMGF
2 m
3 Kg
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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 10-10 N
221
r
MMGF
F cat, book F book, cat
or??
1,2
4 kg3 Kg
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Mearth = 5.98 x 1024 kg
r = 6.38 x 106 m
What is the force between the Earth and a book? 2
21
r
MMGF
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)2kg2
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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:
rearth = 4000 miles
Wearth,Story = MStory (9.8 N/kg)
= (80 kg) (9.8 N/kg) = 784 N
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400 miles above the surface :
rearth = 4000 miles
Wearth,Story = MStory (8.1 N/kg)
= (80 kg) (8.1 N/kg) = 648 N
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WEP
NSP
person
Which force does the scale read?
NFS
WES
NPS
scale
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
WEP
NSP
v = constant
a = 0
Apparent Weight
True Weight
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Elevator
WEP
NSP
a is upward
a
Apparent Weight
True Weight
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Elevator
WEP
NSP
a is downward
a
Apparent Weight
True Weight
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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
WEP
NSP
How large should the normal force be?a =9.8 m/s/s down
g
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Elevator
WEP
a =9.8 m/s/s down
How large should the normal force be?
g Weightless??Apparently
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KC 135
INTERIOR
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