Article about the Gravitational field and gravitational field strength
When you push a book on the table surface until the book moves, your hand touches the book. Likewise, when you tie an object with a piece of rope, then pull it until it moves, your hand touches the rope, the rope touches the object. In this case, the push force, pull force, tension force of the rope, and forces like this are called touch forces or contact forces. Earth’s gravitational force that pulls the fruit falling toward the surface of the earth. Or, the gravitational force of the earth that pulls the moon to the orbit of the earth occurs without touch between the earth and the fruit and moon.
Therefore, gravitational forces or forces like this are called non-touch forces. How could fruit fall and the moon “fall” towards the earth without touching between the earth with fruit and moon? Scientists, including Newton, find it difficult to imagine the concept of non-touch force. In order to more easily imagine and understand the concept of non-touch force, the concept of field is raised.