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PHY4A




Gravitational Fields
A gravitational field exists around any mass, no matter how large or small. Other masses in this region
will feel a force, which is always attractive: a repulsive gravitational force has never been identified.

Gravitational field lines

Gravitational fields are always drawn using gravitational field lines, which…

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PHY4A




g has units Nkg¯¹
g may also be regarded as the acceleration due to gravity (ms¯²) at the point
g is a vector quantity
the variation of g with distance from a mass is another inverse-square relationship

Earth's gravitational field

It's strength is 9.81Nkg¯¹ at the surface of the…

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PHY4A




If a mass at the Earths surface can be given a kinetic energy equal to its gravitational potential energy
(mV), It will escape completely from the Earth's gravitational field. The velocity required to do this is
called the escape velocity, it is not dependent on the mass and is…

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