Question

Earth exerts gravitational force on the moon, keeping it in its orbit. The reaction to this force in the sense of Newton's third law is.

• A. The centripetal force on the moon.
• B. The gravitational force on earth by the moon
• C. The tides due to the moon
• D. None of the above

Answer 1

The correct option is B

The gravitational force on earth by the moon

Gravitational force:

1. The Earth's and Moon's gravitational pulls are a pair of Newton's Third Laws.
2. The Earth has a gravitational force on the Moon, and the Moon has a gravitational pull on the Earth that is equal and opposing.
3. The Moon is kept in orbit around us by the gravity of the Earth. It constantly shifting the Moon's velocity direction.
4. This means that, despite its constant speed, gravity causes the Moon to accelerate all the time.

Therefore the right answer is an option (b) the gravitational force on earth by the moon.