You cannot feel a gravitational force acting between you and a friend because:?

Question

a. gravity is a force applied only by earth
b. living things do not exert any gravational force
c. the mass of a person is not large enough exert gravitiationa force that can be felt.

d. the distance between attracting objects must be very large for gravity to act

plz explain how you got the answer thank you

Answer 1

Another reason for why c has to be the correct answer: None of the other answers make any sense.
A. Gravity is a force applied only by earth.
If this were true, then how would the other planets revolve around the sun?
B. Living things do not exert any gravitational force. See this article for an example of a living thing that exerts gravitational force: http://library.thinkquest.org/C003763/index.php?page=human03
An explanation for why C is correct:
the equation for gravity is F=(G*1st object's mass * 2nd object's mass)/ (r^2)
where G is the universal constant (very small-you would need to have extreme measuring devices)
For people that would be really really small.
For example, the gravitational pull between a 50kg person and a 75kg person 1/2 a meter away from each other would be approx. 10^(-6)N.
D. Not true, and the opposite of this statement would be closer to the truth anyway. See the equation I noted-r refers to the distance between the two objects. As r increases, the force decreases.

Hope this makes sense!

Answer 2

C, because you would have to be massive to have a gravitational pull large enough to be felt.

Answer 3

c. Just consider the weight of someone else vs that of the earth.