Earth attracts a person with a gravitational force of 7.0 × 102 newtons. What is the magnitude of the force with which the individual attracts Earth? 3.0 × 10² newtons 7.0 × 10² newtons 8.5 × 10² newtons 9.8 × 10² newtons
This is a good time to review Newton's 3rd law of motion: "For every action, there is an equal and opposite reaction." Gravitational force always acts in pairs. Whatever force the Earth attracts something with, the thing attracts the Earth with exactly the same force. If Earth attracts a person with a gravitational force of 7.0 × 10² newtons, the person attracts Earth with a gravitational force of 7.0 × 10² newtons. Your weight on Earth is the same as the Earth's weight on you !