Gravitational Fields Flashcards Preview

A level Physics - OCR A (New spec.) > Gravitational Fields > Flashcards

Flashcards in Gravitational Fields Deck (9)
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1

Gravitational Potential

Work done in moving a unit mass from infinity to that point in the gravitational field (scalar)

2

Gravitational Potential Energy

Energy stored in an object (work an object can do) by virtue of the object being in a gravitational field (scalar)

3

Gravitational Field Strength

Force per unit mass (at a point in a gravitational field).

4

Kepler's First Law

The orbit of a planet is an ellipse with the sun at one of the two foci

5

Kepler's Second Law

A line segment connecting a planet to the sun sweeps out equal areas in equal time periods

6

Kepler's Third Law

T^2 d.p. R^3

7

Geostationary Satellite

Remains in same position relative to spot on earth's surface, over equator, time period synchronous to earth's rotation.

8

Escape Velocity

Minimum velocity at which an object has just enough energy to leave a specified gravitational field.

9

Why are all Gravitational Potentials negative?

GPE at infinity is zero.
Work must be done against attractive forces to move a mass from a point in space to infinity, so the GPE at the initial point must be less than zero; negative.