Orbital speeds of planets and satellites
1 mark · EasyState the two factors that affect the gravitational field strength at the surface of a planet.
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Mass and radius of the planet
Also accept: Mass and size of the planet; Mass and distance from its center; Mass and radius
Common mistakes: Gravitational field strength and gravity
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Marking points
B1 · 1 mark · Both mass and radius (or equivalent) are correctly stated.
Worked solution
The two factors are: the mass of the planet and the radius of the planet.