Subjects/Basic Physics/Newton's laws and forces/Newton's first law4. Newton's laws and forcesNewton's first lawIn 4. Newton's laws and forcesFormulaCopy LaTeX∑F=0⟹a=0Detaila body remains at rest or with constant velocity in an inertial frame if the net force is zero.Related formulasRelatedNewton's second law∑F=maOpen formulaOpen in sectionRelatedFirst equilibrium condition∑F=0Open formulaOpen in section