- history of the study of the relationship between space and time in the absence of gravity History of general relativity - history of the non-quantum theory of gravity History of statics – history of the branch of mechanics concerned with the analysis of loads (force, torque/moment) on physical systems in static equilibrium, that is, in a state where the relative positions of subsystems do not vary over time, or where components and structures are at a constant velocity. History of solid-state physics – history of the study of rigid matter, or solids, through methods such as quantum mechanics, crystallography, electromagnetism, and metallurgy. History of vehicle dynamics – history of the dynamics of vehicles, here assumed to be ground vehicles. General concepts of physics Basic principles of physics Physics – branch of science that studies matter and its motion through space and time, along with related concepts such as energy and force. Physics is one of the "fundamental sciences" because the other natural sciences (like biology, geology etc.) deal with systems that seem to obey the laws of physics. According to physics, the physical laws of matter, energy and the fundamental forces of nature govern the interactions between particles and physical entities (such as planets, molecules, atoms or the subatomic particles). Some of the basic pursuits of physics, which include some of the most prominent developments in modern science in the last millennium, include: Describing the nature, measuring and quantifying of bodies and their motion, dynamics etc. Newton's laws of motion Mass, force and weight (Mass versus weight) Momentum and conservation of energy Gravity, theories of gravity Energy, work, and their relationship Motion, position, and energy Different forms of Energy, their inter-conversion and the inevitable loss of energy in the form of heat (Thermodynamics) Energy conservation, conversion, and transfer. Energy source the transfer of energy from one source to work in another. Kinetic molecular theory Phases of matter and phase transitions Temperature and thermometers Energy and heat Heat flow: conduction, convection, and radiation The four laws of thermodynamics The principles of waves and sound The principles of electricity, magnetism, and electromagnetism The principles, sources, and properties of light Basic quantities Acceleration Electric charge Energy Entropy Force Length Mass Matter Momentum Potential energy Space Temperature Time Velocity Gravity, light, physical system, physical observation, physical quantity, physical state, physical unit, physical theory, physical experiment Theoretical concepts: Mass–energy equivalence, elementary particle, physical law,