Gravitational Fields:
Q. What is gravity?
Gravity is the universal attractive force that acts between
all mass-possessing matter.
Q. What is G?
Universal gravitational constant = 6.67 x 10-11 m3
kg-1 s-2.
Q. What can field lines tell you about a field?
The direction of the field, the strength of the field, which
depends on the number of field lines per unit area.
Q. What is g?
g is the force per unit area in a uniform gravitational
field. In a radial field, the magnitude of g is the proportionality constant at
that point between force and mass.
Q. What is Newton’s law of gravitation?
Newton’s law of gravitation states that the gravitational
force acting between 2 point masses is directly proportional to their product
and inversely proportional to the square of the distance between them.
Q. What are satellites? What are they used for?
Satellites are bodies that orbit other, significantly more
massive bodies- they include natural satellites like the moon, as well as
artificial satellites that humans have sent into space. Uses of artificial satellites
include communications, scientific research, and Global Positioning Systems
(GPS).
Q. What are geostationary satellites? What are they used
for?
Geostationary satellites have an orbital period that is
exactly a day, so that they appear stationary above the Earth. They orbit 36000
km above the equator. They are useful for communications and surveying since
they can provide continuous coverage.
Q. What is gravitational potential?
The potential energy per kilogram at any point in the field.
Q. What is gravitational potential difference?
Gravitational potential difference is the difference in the
gravitational potentials of 2 points in a gravitational field.
Q. What is gravitational potential energy at a point in
the field?
The work done per unit mass in moving an object from
infinity to that point in the field.
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