The gravitational force exerted per unit mass on a small object placed at that point within the field
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Why do gravitational field lines point towards the centre of mass of the object producing the field
Gravitational force is attractive
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What field does the field around a spherical mass like a planet form
Radial field
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State newtons law of gravitation
The force between two point masses is directly proportional to the product of masses and inversely proportional to the square of the their separation (the separation is the distance from the centre of the masses of two objects)
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Writ an equation for newtons law of gravitation
F=-GMm/r squared
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What is the equation to find the gravitational field strength at a distance of r from the centre of an object of mass M
g=-GM/r squared
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State keplars first law
The orbit of a planet is an ellipse with the sun at one of the two foci
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State keplars second law
A line segment joining a planet and the sun sweeps out equal areas during equal intervals of time
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State keplars third law
The square of the orbital period T of a planet is directly proportional to the cube of its average distance r from the sun
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What's the equation linked with keplars third law
T squared = (4π squared/GM) multiplied by r cubed
10 of 18
What is the equation for the correct speed of orbit at a distance r from the centre mass of earth
V= square root GM/r
11 of 18
Name the three conditions which are required for a satellite to be In geostationary orbit
The satellite must be in an orbit above the earths equator, rotate in the same direction as the earths rotation, have an orbital period of 24 hours
12 of 18
Define gravitational potential
The work Done per unit mass to move an object to a point from infinity
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What is the equation for gravitational potential
Gravitational potential energy =-GM/r
14 of 18
Define gravitational potential energy
The work done to move the mass from infinity to a point in a gravitational field
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What is the equation for gravitational potential energy
E=-GMm/r
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What is escape velocity
The velocity required to lift an object out of the field
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Equation for escape velocity
V= square root 2GM/r
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Other cards in this set
Card 2
Front
Why do gravitational field lines point towards the centre of mass of the object producing the field
Back
Gravitational force is attractive
Card 3
Front
What field does the field around a spherical mass like a planet form
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