angular momentum
Rotational motion measure
Angular momentum is the rotational equivalent of linear momentum—a measure of how much rotational motion an object has and how hard it would be to stop that rotation.
It depends on mass, speed of rotation, and distance from the axis.
Conservation of angular momentum explains why a spinning figure skater speeds up when pulling in their arms: The skater's angular momentum stays constant, so reducing the radius increases rotation speed.
Spinning disc measuring orientation
- precessionRotating axis gradually reorients
- nutationOscillation in rotation axis
- stabilityResistance to displacement
- attitude controlRegulating rotational position
gyrocompass · spinning top · bicycle wheel · stabilizer · flywheel · gimbal · right-hand rule · wobble
Resistance to angular acceleration
- cross productBinary vector operation
- right-hand ruleVector cross-product technique
- torqueRotational force measurement
- radiusCenter-to-perimeter distance
perpendicular · magnitude · direction · tensor · lever arm
Curved celestial path
- satelliteOrbiting celestial body
- planetStar-orbiting spherical body
- revolutionViolent governmental overthrow
- gravitationalRelating to mass-based attraction
aphelion · perihelion · elliptical · planetary motion · azimuthal
Invariance under transformation
- invarianceQuality of staying unchanged
- closed systemExchange-free bounded region
- rotational symmetryInvariance under angular displacement
- physical lawFundamental rule of nature
Half-integer spin particle
- bosonInteger-spin subatomic particle
- electron spinQuantum angular momentum property
- half-integerNumber midway between integers
- chiralityMirror-image non-superimposability
gyroscope
Spinning disc measuring orientation
- precessionRotating axis gradually reorients
- nutationOscillation in rotation axis
- stabilityResistance to displacement
attitude control · gyrocompass · spinning top · bicycle wheel · stabilizer · flywheel · gimbal · right-hand rule · wobble
moment of inertia
Resistance to angular acceleration
- cross productBinary vector operation
- right-hand ruleVector cross-product technique
- torqueRotational force measurement
radius · perpendicular · magnitude · direction · tensor · lever arm
orbit
Curved celestial path
- satelliteOrbiting celestial body
- planetStar-orbiting spherical body
- revolutionViolent governmental overthrow
gravitational · aphelion · perihelion · elliptical · planetary motion · azimuthal
symmetry
Invariance under transformation
- invarianceQuality of staying unchanged
- closed systemExchange-free bounded region
- rotational symmetryInvariance under angular displacement
physical law · commutator · eigenvalue · quantum number · selection rules
fermion
Half-integer spin particle
- bosonInteger-spin subatomic particle
- electron spinQuantum angular momentum property
- half-integerNumber midway between integers
- Invariantsgenus, homology, signature, connectedness, compactness
- motionmotion, velocity, speed, acceleration, locomotion
- physicsphysics, atom, acceleration, gravity, force
- mechanicsforce, turning, rotation, velocity, acceleration
- rotationrotation, spin, axis of rotation, rotational motion, revolutions
- spintopspin, backspin, sidespin, clockwise, counterclockwise