Gravitational Fields

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What is a gravitational field?
A region of space in which a mass feels a force
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What is gravitational field strength?
Gravitational force per unit mass, Nkg-1 or ms-2
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What is the equation for gravitational field strength?
g = F/m
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What is gravitational potential?
Work done per unit mass to move an object from infinity to that point
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What is the equation for gravitational potential in a uniform field?
V = gΔh
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What is the equation for gravitational potential in a radial field?
V = -Gm/r
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g =
g = F/m = Gm/r^2
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What is Newton's Law of Gravitation?
Gravitational force between two masses is proportional to the product of the masses and is inversely proportional to the square of separation
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What is the equation for Newton's Law of Gravitation?
F = GMm/r^2
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What is an equipotential surface?
Where there is no change in GPE when moved along the surface
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What is Kepler's Third Law?
Radius of orbit squared is proportional to the time period of the orbit cubed. r^2 ∝ T^3
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How do you prove Kepler's Third Law?
mv^2/r = GMm/r^2 and rearrange for r^2
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What is gravitational potential difference?
Work done per unit mass to move an object between two points
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How do you find work done in moving an object in a gravitational field?
W = mV = -GMm/r
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What is escape velocity?
Velocity required to escape a body's gravity
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How do you find escape velocity?
KE = Wd
0.5mv^2 = mV = -GMm/r
v = √(2GM/r)
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What are the main differences betweeen gravitational fields and electric fields?
Gravitational fields affect particles with mass, electric fields affect particles with a charge - Gravitational fields are always attractive, electric fields are either attractive or repulsive - In a gravitational field it is not possible to shield a mass
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Other cards in this set

Card 2

Front

What is gravitational field strength?

Back

Gravitational force per unit mass, Nkg-1 or ms-2

Card 3

Front

What is the equation for gravitational field strength?

Back

Preview of the front of card 3

Card 4

Front

What is gravitational potential?

Back

Preview of the front of card 4

Card 5

Front

What is the equation for gravitational potential in a uniform field?

Back

Preview of the front of card 5
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