D.1 Gravitational fields
D.1.2—Universal gravitation
D.1.3—Point-mass approximation
D.1.4—Gravitational field strength
D.1.5—Gravitational field lines
D.1.6 (HL)—Gravitational potential energy
D.1.7 (HL)—Two-body potential energy
D.1.8 (HL)—Gravitational potential
D.1.9 (HL)—Potential gradient
D.1.10 (HL)—Work in gravitational fields
D.1.11 (HL)—Gravitational equipotentials
D.1.12 (HL)—Equipotentials and field lines
D.1.13 (HL)—Escape speed
D.1.14 (HL)—Orbital speed
D.1.15 (HL)—Atmospheric drag on orbits
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