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Earth's gravitational field (Gravitational potential energy (energy of…
Earth's gravitational field
Weight
Force on an object due to a gravitational field
not constant
w=mg
mass remains constant
g dependant on acceleration due to gravity
g=GM/r^2
Variations in field strength
altitude changes (geographic formations)
density variation (more dense=greater ; less dense=lesser)
not perfectly spherical earth (radius greater at equator)
Gravitational potential energy
energy of mass due to its position within a gravitational field
Ep = mgh
infinity as level of zero gravitational potential energy (therefore all objects within field will have negative Ep)
Ep = -Gm1m2/r
work done
Diagram + Graph
go with field : lose potential energy
go against field : gain potential energy
Pendulum experiment