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8. Gravitational Field Summary

GCE A Level H2 Physics - Teaching Tool


on 21 May 2014

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Transcript of 8. Gravitational Field Summary

photo credit Nasa / Goddard Space Flight Center / Reto Stöckli
Gravtational Force
Gravitational Field Strength
gravitational force per UNIT MASS
of object with mass M
Gravitational Potential
Work Done in moving UNIT MASS from infinity to final point (radius R away from centre of body of mass M)
Potential Energy
Work done required in moving body of mass m from infinity to final position (radius R away from centre of body of mass M)
Escape Velocity
minimum kinetic energy required for gain in GPE from surface to Earth to INFINITY
gravitational constant
Earth: g = 9.81 N/kg
gravitational field lines
gravitational potential at infinity = ZERO
Equipotential Surface
Satellites in Circular Orbits
Gravitational Force = Centripetal Force
minimum starting velocity
loss in KE = gain in GPE
i.e. Earth surface - only KE -->
infinity - only GPE, no KE
Geostationary Orbit
Period of revolution, T = 24 hours
plane of revolution in plane with Equator
satellite revolves from WEST to EAST
Energy of Satellite in Orbit
gravitational field strength
gravitational force
gravitational potential energy
gravitational potential
Full transcript