A gravitational field is a region of space around a mass where another mass experiences a force of attraction. It is an invisible field that pulls objects towards the centre of the mass generating the field, such as how Earth pulls objects towards it. The strength of this field decreases with distance, meaning objects further away feel a weaker gravitational pull. In GCSE Physics, understanding the concept of a gravitational field is essential to explain why objects fall to the ground and why planets orbit stars. The strength of a gravitational field is measured in newtons per kilogram (N/kg).
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