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Constant-speed circular motion still has centripetal acceleration.
Tilting the road keeps a vehicle from slipping at a curve.
Force between two masses ∝ product of masses, inverse square of distance.
g decreases both with altitude and depth, for different reasons.
Stored energy between two masses — zero at infinity, negative at finite separation.
Speed at which gravity exactly provides the centripetal force.
Minimum launch speed that lets an object escape gravity forever.
Three laws of planetary orbits — ellipse, equal areas, T² ∝ a³.