Flashcards in Gravitational Fields Deck (11):

1

## Gravitational field strength

### force per unit mass

2

## Newton's law of gravitation

### the gravitational force between two masses is proportional to the product of the masses and inversely proportional to the distance squared between them

3

## Deriving Kepler's law

###
Equate the centripetal force to gravitational force.

x by r.

substitute centripetal velocity then rearrange for T^2.

4

## Kepler's third law

### the cube of the planets distance from the sun divided by the square of the orbital time period is the same for all planets

5

## Geostationary Orbit

### an equatorial orbit with a time period equal to the rotation period of the earth and in the same direction as the earth’s rotation

6

## Uses for geostationary satellites

### Radio communications, spying

7

## which equation can be used to find the force between two point masses or spherical objects

### F= (GMm)/r^2

8

## Equation for gravitational field strength, or to determine the mass of the earth

### g= (GM)/r^2

9

## describe the gravitational field strength of the earth

### close to the surface it is uniform and approximately equal to the acceleration of free fall

10

## How/why do you use the inverse square law

### to analyse circular orbits by relating the gravitational force to the centripetal acceleration it causes

11