Which objects have gravitational fields

A gravitational field is where a mass experiences a force. All matter has a gravitational field that attracts other objects. The more mass an object has, the greater its gravitational field will be. For example, the Earth has a greater gravitational field than the Moon because it has a much greater mass than the Moon.

The formula that links mass and gravitational field strength is:. This is when:. Weight refers to the gravity force of planets and other bodies in the Universe, and the effect that this has on objects. We could then define the gravitational field strength as the acceleration an object will experience within that gravitational field. From this arrangement of the equation, our definition of gravitational field strength now becomes:.

The gravitational field strength at a point is the gravitational force exerted per unit mass placed at that point. You can use this to find the gravitational field strength of a mass at a particular point, r. Note that the gravitational field strength of the Earth near its surface is numerically equal to the acceleration of free fall, 9.

Gravity as a field of force The effects of the Earth's gravity extend far out into space. Gravity field lines representation is arbitrary as illustrated here represented in 30x30 grid to 0x0 grid and almost being parallel and pointing straight down to the center of the Earth.

The Earth's gravitational field is represented by parallel lines on small scales. As you can see, a quarter of lines of force goes through the plane when the distance is doubled. Any two point masses attract each other with a force that is proportional to each of their masses and inversely proportional to the square of the distance between them.

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