Quote: physics is those sciences expressible in mathematical terms and measurements; wide application [»einsA5_1940]

Quote: the task of the physicist is to find the universal elementary laws from which the cosmos can be built by pure deduction

Quote: fundamental physics is like the rules of the game of nature; can thus understand the world even though its application may be much too complicated [»feynRP_1963]

Quote: mass, gravitational attraction and molecule are intrinsic features of the world; the realm of natural science

Quote: size, shape, place, adjacency, quantity, and speed are fundamental properties of material substance [»galiG_1623]

Quote: in physics we try to say things that no one knew before in a way that everyone can understand [»campNR_1919, OK]

Quote: quantum electrodynamics describes all physical phenomena except gravity, radioactivity and nuclear physics; there is no significant difference between experiment and theory [»feynRP_1985]

Quote: computer science is messy because it lacks the locality, symmetry, and invariance to scale found in physics [»hillWD_1985]

Quote: vital principles do not change the course of motion; motion is part of the pre-established order of nature [»leibGW5_1705]

Quote: the scientific definition of speed is the ratio of infinitesimal distance over infinitesimal time as the time gets smaller and smaller; not known to the Greeks

Quote: in Zeno's argument there is an infinite number of steps but not an infinite amount of time; instead, a derivative concerns the ratio of infinitesimals [»feynRP_1963]

Quote: for linear systems independent of time, there are usually a series of special motions which vary exponentially in time; the most general motion is a superposition of these special motions; e.g., vibrating systems with imaginary exponentials [»feynRP_1963]

Quote: the things that really are in the world without us, are those motions by which these seemings are caused

Quote: the mass of a body is a measure of its energy-content; radiation of energy conveys inertia between the emitting and absorbing bodies [»einsA_1905b]

Quote: can locate energy because it is conserved locally; this agrees with energy's equivalence to mass and hence gravitational forces [»feynRP_1964]

Quote: mass or inertia is how hard it is to hold something which is going around in circle [»feynRP_1963]

Quote: light carries a momentum which is 1/c of its energy; from radiation pressure due to moving charges in a magnetic field [»feynRP_1963]

Quote: the elements are of eternal stuff, linked with bonds of different strengths; unless a strong enough force encounters it, a thing stays safely as it was [»lucr_55]

Quote: potential energy (dead force) is elementary to kinetic energy (living force)

Quote: force is real; space, time, and motion are relative, a relationship [»leibGW4_1695]

Quote: the laws of motion must preserve the relative nature of motion

Quote: force should be estimated by the size of its effect instead of its motion [»leibGW_1686b]

Quote: use force to explain corporeal phenomena; size, shape, and motion are not entirely real [»leibGW_1686b]

Quote: matter is nothing but force; matter does not itself exist; we experience matter as force [»wallAR_1870, OK]

Quote: classical mechanics treats particles as discrete points in a continuous field; hence the corpuscle modifies the properties of the surrounding space [»debrL_1937]

Quote: a corpuscle is the center of an extended phenomenon; a point with spatial extension

Quote: material points are not fundamental; reality is a continuous field with regions of high energy density [»einsA4_1950]

Quote: the coefficient of friction is an artifact; two pieces of pure copper will stick together because the atoms get "confused", and a glass tumbler will scratch a wetted glass plate [»feynRP_1963]

Quote: gravity apparently goes forever inversely as the square of the distance; i.e., the gravitational force on a spherical shell is independent of its radius

Quote: the theory of gravitation had an immense effect on science; here was a simple rule that governed the motion of the planets [»feynRP_1963]

Quote: because the force of gravity is proportional to mass, a small satellite inside a large one is perfectly balanced or weightless

Quote: the galaxy is not a ball because of angular momentum; it must contract mostly in a plane [»feynRP_1963]

Quote: for a conservative force, the work done by moving an object does not depend on the path; i.e., kinetic energy plus potential energy is constant [»feynRP_1963]

Quote: all fundamental forces of nature appear to be conservative

Quote: at the microscopic, deepest level of physics, all forces are conservative forces

Quote: Kepler's law about equal areas in equal times is the law of conservation of angular momentum when there is no torque, i.e., the force is radial [»feynRP_1963]

Quote: energy conservation law: if energy goes away from a region, it flows through the boundary of that region; similarly, charge conservation requires a local conservation law [»feynRP_1964]

Quote: the laws of conservation of momentum and energy hold exactly in quantum mechanics [»heisW_1927]

Quote: God conserves force but not motion [»leibGW_1686b]

Quote: perpetual motion is impossible; due to friction and the conservation of force

Quote: conservation of power; force can not be created, annihilated, or suspended [»faraM_1855, OK]

Quote: the total force of interrelated bodies is conserved as well as their total direction [»leibGW5_1705]

Quote: mechanical laws are never violated in natural motion; force and direction are always conserved

Quote: action of one substance on another due to the inherent connections between things; the present contains the future [»leibGW_1686c]

Quote: bodies at rest stay at rest; bodies in motion stay in motion; nothing can change itself [»hobbT_1651, OK]

Quote: everyone who has tried to make a nuclear explosion has succeeded on the first try [»mcphJ_1974]

Quote: what would it take to propel downtown Chicago through space at a few million miles an hour? [»mcphJ_1974]

Quote: a 1 kiloton fission device can make a 10 foot by 1000 foot hole; use for a transportation tunnel across the U.S. [»mcphJ_1974]

Quote: carbon attracts oxygen much more strongly than carbon and much more strongly than oxygen attracts oxygen; so burning causes great commotion which heats things up [»feynRP_1963]

Quote: rain from clouds is similar to laundry becoming damp with moisture from the sea [»lucr_55]

Quote: the sun evaporates water from the sea; the sea is vast, yielding much water [»lucr_55]