Gravitational Field Intensity Due To A Point Mass — the NEET Physics formula with its derivation, variables, validity constraints and worked solver.
Gravitational Field Intensity due to a Point Mass Applies to point masses or spherically symmetric mass distributions outside the shell (where r >= Radius). Start with Newton's Law of Universal Gravitation: F = GMm/r 2 Define Gravitational Field Intensity (g) as Force per unit mass: g = F/m Substitute F into the definition Cancel mass m: g = GM/r 2 r must be greater than 0 Assumes non-relativistic speeds Assumes static source mass Confusing Gravitational Field Intensity (g) with Gravitational Force (F) Assuming g is constant at all distances (true only for small height changes near surface) Believing the field exists instantly (neglecting speed of light/gravity propagation)