In physics, static equilibrium, or neutral balance, exists when the forces (actions), and torques, on all components of a defined system are balanced such that no component is undergoing an acceleration relative to the designated frame of reference. The willingness to question previously held truths and search for new answers resulted in a period of major scientific advancements, now known as the Scientific Revolution. ... In physics, a force is defined as the time derivative of momentum: F = dp/dt = d(mv)/dt If mass m is constant, then second Newtons law mathematically follows from this definition: F = d(mv)/dt = m(dv/dt) = m · a If the mass m is measured in kilograms... In physics, the action principle is an assertion about the nature of motion, from which the trajectory of an object subject to forces can be determined. ... The concept of torque in physics, also called moment or couple, originated with the work of Archimedes on levers. ... Acceleration is the time rate of change of velocity, and at any point on a v-t graph, it is given by the gradient of the tangent to that point In physics, acceleration (symbol: a) is defined as the rate of change (or time derivative) of velocity. ...

Examples: A paperweight on a desk. If an inertial reference is chosen to be identical to the motion of the room, then the system of the desk and paperweight can be considered as in static equilibrium with respect to the floor. Small accelerations due to the background motion of Earth (see Coriolis effect, centripetal acceleration) are neglected by choosing this coordinate system for analysis of the system. In physics, the Coriolis effect is the apparent deflection of a freely moving object as observed from a rotating frame of reference. ... A centripetal force is a force pulling an object toward the center of a circular path as the object goes around the circle. ...

For related detailed analysis methods see engineering mechanics and statics. Engineering mechanics is a branch of the physical sciences which looks to understand the actions and reactions of bodies at rest or in motion. ... Statics is the branch of physics that is concerned with physical systems that are 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 rest under the action of external forces of equilibrium. ...

See also: Dynamic equilibrium A dynamic equilibrium will form if, at a given temperature, two reversible processes occur at the same rate. ...