Older MCQs might not have the typical A, B, C,
D
choices. They
have choices 1, 2, 3, and a combination of them is the answer. Below is the key that maps such
combinations to the answer.
A
1, 2 and 3 are correct
B
1 and 2 only are correct
C
2 and 3 only are correct
D
1 only is correct
Define gravitational field strength as force per unit mass; recall and use the equation gravitational field strength = weight / mass, g = W/m and know that this is equivalent to the acceleration of free fall
Know that the strength of the gravitational field: (a) at the surface of a planet depends on the mass of the planet (b) around a planet decreases as the distance from the planet increases
State that the acceleration of free fall g for an object near to the surface of the Earth is approximately constant and is approximately 9.8 m/s²