Fill in the blanks with suitable words:
a) The acceleration due to gravity on the moon is about ________ of that on the earth.
b) In order that the force of gravitation between two bodies may become noticeable and cause motion, one of the bodies must have an extremely large _______
c) The weight of an object on the earth is about ________ of its weight on the moon.
d) The weight of an object on the moon is about _________ of its weight on the earth.
e) The value of g on the earth is about ________ of that on the moon.
f) If the weight of a body is 6N on the moon, it will be about ________ on the earth.