A point particle, ideal particle or point-like particle (often spelled pointlike particle) is an idealization of particles heavily used in physics. Its...

In the physical sciences, a particle (or corpuscle in older texts) is a small localized object which can be described by several physical or chemical properties...

the body's centroid; and orbital angular acceleration, involving a point particle and an external axis. Angular acceleration has physical dimensions of...

radians, the arc-length from the positive x-axis around the circle to the particle is ℓ = r ϕ {\displaystyle \ell =r\phi } , and the linear velocity is v...

that behaves as a whole Point particle, or point mass, an idealization of an object with finite mass but of zero size A particle of a medium in continuum...

In particle physics, an elementary particle or fundamental particle is a subatomic particle that is not composed of other particles. The Standard Model...

test particle is its electric charge and its mass. In this situation it is often referred to as a test charge. The electric field created by a point charge...

L is the angular momentum vector and t is time. For the motion of a point particle, L = I ω , {\displaystyle \mathbf {L} =I{\boldsymbol {\omega }},} where...

force is the force exerted on a charged particle by electric and magnetic fields. It determines how charged particles move in electromagnetic environments...

string theory and related subjects. Unlike elementary particles, which are zero-dimensional or point-like by definition, strings are one-dimensional extended...

Wave–particle duality is the concept in quantum mechanics that fundamental entities of the universe, like photons and electrons, exhibit particle or wave...

often models real-world objects as point particles, that is, objects with negligible size. The motion of a point particle is determined by a small number...

a physical object that generalizes the notion of a zero-dimensional point particle, a one-dimensional string, or a two-dimensional membrane to higher-dimensional...

notion of "unrestricted" configuration space, i.e. in which different point particles may occupy the same position. In mathematics, in particular in topology...

physics, mathematics, and philosophy. The model consists of an idealized point particle initially sitting motionless at the apex of an idealized radially-symmetrical...

angular momentum for a point particle is classically represented as a pseudovector r × p, the cross product of the particle's position vector r (relative...

nuclear reactions) is a subatomic particle with a negative one elementary electric charge. It is a fundamental particle that comprises the ordinary matter...

the principles of Lagrangian mechanics. Just as the action for a free point particle is proportional to its proper time – i.e., the "length" of its world-line...

orbiting each other in space. The problem assumes that the two bodies are point particles that interact only with one another; the only force affecting each...

motion are equations of motion which extend Newton's laws of motion for point particle to rigid body motion. They were formulated by Leonhard Euler about 50...

the body, namely the position of one of the particles of the body, specifically chosen as a reference point (typically coinciding with the center of mass...

postulates no physical particle or wave entities, only observed wave-particle duality). The pilot wave guides the motion of the point particles as described by...

position operator x and momentum operator px in the x direction of a point particle in one dimension, where [x , px] = x px − px x is the commutator of...

Higgs boson, sometimes called the Higgs particle, is an elementary particle in the Standard Model of particle physics produced by the quantum excitation...

physics, string theory is a theoretical framework in which the point-like particles of particle physics are replaced by one-dimensional objects called strings...

than six degrees of freedom. In classical mechanics, the state of a point particle at any given time is often described with position and velocity coordinates...

arc length (the natural parametrization). From the point of view of a theoretical point particle on the curve that does not know anything about the ambient...

A gravitational lens is matter, such as a cluster of galaxies or a point particle, that bends light from a distant source as it travels toward an observer...

physics, a sigma model is a field theory that describes the field as a point particle confined to move on a fixed manifold. This manifold can be taken to...

reconcile gravity and quantum mechanics. In string theory, the point-like particles of particle physics are replaced by one-dimensional objects called strings...