7a. Gravitational Fields Flashcards
1
Q
Gravitational field strength
A
The force done per unit mass.
2
Q
Gravitational potential
A
The work done per unit mass to bring an object from infinity to that point.
3
Q
Equipotential
A
A line of equal potential or constant gravitational potential - this will be a circle around a single radial field.
4
Q
Escape velocity
A
The minimum velocity required for an object to completely exit a gravitational field.
5
Q
Geostationary satellite
A
A satellite that has an orbital period of 24 hours orbits in the same plane as the equator - hence does not appear to move from its position over the earth.
6
Q
Kepler’s third law
A
For any planet, the cube of the radius of its orbit is equal to the square of the orbital period.
