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Calculation of g ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
g is a vector g from planet g from star Total g = Vector sum Star planet
Gravitational PE ,[object Object],[object Object],[object Object],[object Object],PE N S S N F F
Gravitational PE ,[object Object],[object Object],[object Object],[object Object],- PE S N S N F F
Gravitational Potential ,[object Object],[object Object],[object Object],planet A distant object has zero PE Attracted by gravity Negative PE Back to zero energy Amount of work needed to remove object Zero energy
Gravitational Potential Energy planet 1 kg Attracted by gravity Negative PE Back to zero energy 2kg The potential at a point is the energy needed to move 1 kg from infinity to that point The potential energy of an object is the energy needed to move the object from infinity to that point PE = mV = -GMm/r V = -GMm/r Amount of work needed to remove 1kg Zero energy Amount of work needed to remove 2 kg
Escape velocity ,[object Object],[object Object],[object Object],[object Object],[object Object],Calculate the escape velocity of Earth  r= 6.4 x10 6 m  m =6 x 10 24  kg v =   (2GM/r) =    (2 x 6.67 x 10 -11  x 6 x10 24  / 6.4 x10 6 )  = 11 000 ms -1   = 11kms -1   planet

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F = G Mm

  • 1.
  • 2. g is a vector g from planet g from star Total g = Vector sum Star planet
  • 3.
  • 4.
  • 5.
  • 6. Gravitational Potential Energy planet 1 kg Attracted by gravity Negative PE Back to zero energy 2kg The potential at a point is the energy needed to move 1 kg from infinity to that point The potential energy of an object is the energy needed to move the object from infinity to that point PE = mV = -GMm/r V = -GMm/r Amount of work needed to remove 1kg Zero energy Amount of work needed to remove 2 kg
  • 7.