Given:
Weight of person on earth = 500 N
Let's solve for the following:
• (a). What is the gravitational force that the person exerts on the earth?
Since the person is on earth, according the Newton's third law, the gravitational force that the person exerts on the -500N
According to Newton's third law, for every action there's an equal and opposite reaction.
Since the weight of the person on earth is 500 N, the gravitational force that he exerts on the earth is -500 N.
Therefore, the gravitational force that he exerts on the earth is -500 N.
• (b). What is the gravitational force exerted by the earth on the person.
To find the gravitational force exerted by the earth on the person, we have:
The gravitational force exerted by the earth on a person can be called the weight of the body.
Therefore, the gravitational force exerted by the earth on the person is 500 N.
ANSWER:
(a). -500 N
(b). 500 N