photo credit Nasa / Goddard Space Flight Center / Reto Stöckli
Gravtational Force
NEWTON's LAW of GRAVITATION
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)
Gravitational
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 FIELD
summary
gravitational constant
Earth: g = 9.81 N/kg
gravitational field lines
gravitational potential at infinity = ZERO
Equipotential Surface
mrcheung
Satellites in Circular Orbits
Gravitational Force = Centripetal Force
GRAVITATIONAL FIELD
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
U
g
gravitational field strength
gravitational force
gravitational potential energy
gravitational potential
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8. Gravitational Field Summary
GCE A Level H2 Physics - Teaching Tool
