100 Words Related to Gravity

No.	Term	Definition
1.	acceleration due to gravity	Downward acceleration from gravity.
2.	accretion disk	Orbiting matter around massive object.
3.	altitude	Height above a reference level.
4.	apoapsis	Farthest point in an orbit.
5.	apparent weight	Measured support force on a body.
6.	astronaut	Person in spaceflight conditions.
7.	atmospheric drag	Air resistance opposing motion.
8.	attraction	Force drawing bodies together.
9.	barycenter	Common center of mass of system.
10.	black hole	Region with escape impossible.
11.	buoyancy	Upward force in a fluid.
12.	center of mass	Balance point of mass distribution.
13.	centrifugal force	Apparent outward force in rotation.
14.	centripetal acceleration	Inward acceleration for circular motion.
15.	centripetal force	Inward force for circular motion.
16.	cosmic web	Large-scale structure shaped by gravity.
17.	curvature of spacetime	Geometry change caused by mass-energy.
18.	deceleration	Reduction in speed or velocity.
19.	density	Mass per unit volume.
20.	dipole anomaly	Gravity variation from mass distribution.
21.	downforce	Aerodynamic force pressing downward.
22.	drag coefficient	Factor describing drag magnitude.
23.	drop	Fall under gravity.
24.	eccentricity	Measure of orbit’s noncircularity.
25.	Einstein field equations	Relate spacetime curvature to energy.
26.	Einstein ring	Ring image from gravitational lensing.
27.	elevator	Cabin illustrating weight changes.
28.	elliptical orbit	Oval path under gravity.
29.	escape speed	Speed needed to leave gravity well.
30.	event horizon	Boundary of a black hole.
31.	fall	Move downward under gravity.
32.	falling	Undergoing gravitational descent.
33.	force	Push or pull causing acceleration.
34.	free fall	Motion under gravity alone.
35.	g	Standard gravitational acceleration symbol.
36.	g-force	Acceleration felt relative to free fall.
37.	galaxy cluster	Group of galaxies bound by gravity.
38.	geodesic	Shortest path in curved spacetime.
39.	geoid	Earth’s mean sea-level shape.
40.	gravitational acceleration	Acceleration produced by gravity.
41.	gravitational binding energy	Energy required to disperse a system.
42.	gravitational collapse	Contraction under self-gravity.
43.	gravitational constant	Constant in Newton’s gravity law.
44.	gravitational field	Region where gravity acts.
45.	gravitational lensing	Light bending by gravity.
46.	gravitational mass	Mass determining gravitational interaction.
47.	gravitational microlensing	Small lensing brightening by a mass.
48.	gravitational potential	Potential energy per unit mass.
49.	gravitational radiation	Energy carried by gravitational waves.
50.	gravitational redshift	Light loses energy climbing gravity.
51.	gravitational tide	Differential gravity across an object.
52.	gravitational time dilation	Time runs slower in stronger gravity.
53.	gravitational waves	Ripples in spacetime curvature.
54.	gravity anomaly	Local deviation from expected gravity.
55.	gravity assist	Speed change via planetary flyby.
56.	gravity gradient	Change of gravity with position.
57.	gravity well	Potential “dip” around a mass.
58.	inertial mass	Mass resisting acceleration.
59.	inertial reference frame	Non-accelerating frame for Newton’s laws.
60.	inverse-square law	Force decreases with distance squared.
61.	isostasy	Crust floating balance under gravity.
62.	J2 perturbation	Orbit effect from Earth’s bulge.
63.	jerk	Rate of change of acceleration.
64.	Kepler’s laws	Rules describing planetary orbits.
65.	kilogram	SI unit of mass.
66.	lagrange point	Stable point in two-body gravity.
67.	launch window	Timing for efficient orbital insertion.
68.	lift	Aerodynamic force opposing weight.
69.	mass	Amount of matter; inertia measure.
70.	mass-energy	Energy content that curves spacetime.
71.	microgravity	Near-weightless orbital environment.
72.	moon	Natural satellite bound by gravity.
73.	Newton’s law of gravitation	Attraction proportional to masses, inverse-square.
74.	Newton’s second law	Force equals mass times acceleration.
75.	normal force	Support force perpendicular to surface.
76.	null geodesic	Light’s path in curved spacetime.
77.	obliquity	Axial tilt affecting gravity field.
78.	orbit	Path around a body under gravity.
79.	orbital decay	Orbit shrinks due to drag or tides.
80.	orbital energy	Total energy of an orbiting body.
81.	orbital inclination	Tilt of orbit relative to reference plane.
82.	orbital period	Time to complete one orbit.
83.	orbital velocity	Speed needed to maintain orbit.
84.	periapsis	Closest point in an orbit.
85.	planet	Large body orbiting a star.
86.	potential energy	Energy stored by position in field.
87.	precession	Slow rotation of orbital axis.
88.	projectile motion	Trajectory under gravity and initial velocity.
89.	radial acceleration	Acceleration toward or away from center.
90.	reaction force	Equal and opposite force response.
91.	relativity	Physics of spacetime and gravity.
92.	Roche limit	Distance where tides can disrupt a body.
93.	satellite	Body orbiting another by gravity.
94.	Schwarzschild radius	Radius defining black hole horizon.
95.	sink rate	Downward speed under gravity effects.
96.	solar system	Star and bound orbiting bodies.
97.	space elevator	Proposed tether balancing gravity and rotation.
98.	space-time	Unified framework of space and time.
99.	spaghettification	Tidal stretching near black holes.
100.	specific orbital energy	Orbital energy per unit mass.