Answer:
Step-by-step explanation:
Gravity is the force that gives most of the large objects in the Universe their structure. It holds the Earth together and in its orbit around the Sun. It holds the Sun together and in its orbit around the Milky Way. It even holds the Universe itself together.
Gravity also causes many astronomical phenomena such as tides. As perhaps the most important force for large objects, we need to understand its basic properties.
Every object exerts a gravitational force of attraction on every other object.
The gravitational force between two objects depends on their masses, being larger for larger masses.
The gravitational force between two objects depends on their separation, being weaker the farther apart the objects are.
Newton discovered the mathematical expression for the force of gravity and showed it has the following form.
Force of gravity = constant x Mm/r2, Where M and m are the masses and r is their separation. The constant is called the Universal gravitational constant and its value depends on the units used.
If the masses are in kilograms (kg) and the distance is measured in meters, and the force in metric units called newtons, then G =6.67x10-11 newton-m2-kg-2.
