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Thermal Energy Transfer The conservation of energy states that energy is never created or destroyed, only transferred from one form to another When a thermometer is placed in a beaker of boiling wa...
Gravitational Potential Energy Between Two Point Masses The gravitational potential energy (G.P.E) at point in a gravitational field is defined as: The work done in bringing a mass from infinity to...
Gravitational Potential The gravitational potential energy (G.P.E) is the energy an object has when lifted off the ground given by the familiar equation: G.P.E = mgΔh The G.P.E on the surface of th...
The Value of g on Earth Gravitational field strength g is approximately constant for small changes in height near the Earth’s surface (9.81 m s-2) This is because from the inverse square law relati...
Deriving Gravitational Field Strength (g) The gravitational field strength at a point describes how strong or weak a gravitational field is at that point The gravitational field strength due to a p...
Geostationary Orbits Many communication satellites around Earth follow a geostationary orbit This is a specific type of orbit in which the satellite: Remains directly above the equator, therefore, ...
Circular Orbits in Gravitational Fields Since most planets and satellites have a near circular orbit, the gravitational force FG between the sun or another planet provides the centripetal force nee...
Newton's Law of Gravitation The gravitational force between two bodies outside a uniform field, e.g. between the Earth and the Sun, is defined by Newton’s Law of Gravitation Recall that the mass of...
Defining Gravitational Field There is a force of attraction between all masses This force is known as the ‘force due to gravity’ or the weight The Earth’s gravitational field is responsible for the...
