The force of gravity on a person or object on the surface of a planet is called
a. mass.
b. terminal velocity.
c. weight.
d. free fall.

thx

The force of gravity on a person or object on the surface of a planet is known as weight.  

•There is confusion between weight and mass.  

•The measure of the amount of matter in an object is termed mass. While the measure of the gravitational force exerted on an object is termed as weight.  

•Weight refers to the force of gravity on an object or person at the surface of a planet.  

•With the change in the strength of the gravitational force, a variation is witnessed in one's weight, while mass does not change.  

Thus, the correct answer is option C, that is, weight.

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i think the answer would be reserve.