Which of the following is a correct statement about gravitational force?
A. It is applicable only to our solar system.
B. It is both an attractive and repulsive force.
C. It is directly proportional to the product of the masses involved.
D. It is directly proportional to both the mass and radius of the earth.
The Attempt at a Solution
The answer I got for this question is "C" because it seems to be the most correct out of the four possible choices but I was just wondering I am correct because:
A) It cannot only be applicable to our solar system because we have not yet discovered or know enough of other solar systems to make this assumption therefore "A" is wrong.
B)Gravitational force is defined as an attractive force emitted by particles that attracts other particles, so therefore I am guessing, it cannot be a repulsive force therefore "B" is wrong.
However I have heard somewhere that a gravitational force that is repulsive does exist in dark matter, so I was just wondering if this could make "B" correct?
C)Is what I guess to be right.
D)Gravitational force exists on other planets also, therefore it cannot be possible that it is directly proportional to both the mass and radius of Earth in every case, so "D" is wrong.