# Orbital Energy

## Energy and Satellite Motion

### However, by convention, we state that Gravitational Potential Energy is equal to 0 J at infinity, and as such , the formula is given as :- ## Gravitational Potential

### The diagram below shows how the Gravitational Potential varies as a spacecraft moves away from the Earth. ## Kinetic Energy of a Satellite

### As previously stated, the Kinetic Energy of a satellite can be found be deriving a form of Ek=1/2mv2, based upon a Centripetal Force calculation :- ## Combined Energy of a Satellite

### The combined energy of a satellite can be found simple by the addition of the Kinetic Energy and the Gravitational Potential Energy :- ## Movement within a Gravitational Field

### Gravitational fields are conservative fields. In a conservative field, any round trip (A trip that starts and ends at the same point) requires no Work to be Done. If no Work is Done, then Energy is conserved. The diagram below shows a route that a spacecraft could take within a Gravitational field :- 