Gravitational field
= Gravitational field
{title2=$\mathbf g$}
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In <Newtonian gravity>, the gravitational field $\mathbf g$ specifies the <acceleration> of a freely falling <test particle> at each position. A <gravitational potential> $\Phi$ gives $\mathbf g=-\nabla\Phi$, with the <gradient> taken in the spatial geometry of the model. In <general relativity>, the <metric tensor> describes gravitational effects, and <tidal forces> are encoded by <spacetime> curvature.