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  2. Stopping sight distance - Wikipedia

    en.wikipedia.org/wiki/Stopping_sight_distance

    d PRT = driver perception-reaction distance, m (ft) V = design speed, km/h (mph) t = brake reaction time, in seconds. Based on the results of many studies, 2.5 seconds has been chosen for a perception-reaction time. This time will accommodate approximately 90 percent of all drivers when confronted with simple to moderately complex highway ...

  3. Braking distance - Wikipedia

    en.wikipedia.org/wiki/Braking_distance

    The other component is the reaction distance, which is the product of the speed and the perception-reaction time of the driver/rider. A perception-reaction time of 1.5 seconds, [ 2 ] [ 3 ] [ 4 ] and a coefficient of kinetic friction of 0.7 are standard for the purpose of determining a bare baseline for accident reconstruction and judicial ...

  4. Jerk (physics) - Wikipedia

    en.wikipedia.org/wiki/Jerk_(physics)

    Jerk (also known as jolt) is the rate of change of an object's acceleration over time. It is a vector quantity (having both magnitude and direction). Jerk is most commonly denoted by the symbol j and expressed in m/s 3 ( SI units ) or standard gravities per second ( g 0 /s).

  5. Relaxation (physics) - Wikipedia

    en.wikipedia.org/wiki/Relaxation_(physics)

    The relaxation time is a measure of the time it takes for one object in the system (the "test star") to be significantly perturbed by other objects in the system (the "field stars"). It is most commonly defined as the time for the test star's velocity to change by of order itself. [6] Suppose that the test star has velocity v.

  6. Mental chronometry - Wikipedia

    en.wikipedia.org/wiki/Mental_chronometry

    Representation of the stages of processing in a typical reaction time paradigm. Mental chronometry is the scientific study of processing speed or reaction time on cognitive tasks to infer the content, duration, and temporal sequencing of mental operations.

  7. Damköhler numbers - Wikipedia

    en.wikipedia.org/wiki/Damköhler_numbers

    where the space-time is defined to be the ratio of the reactor volume to volumetric flow rate. It is the time required for a slug of fluid to pass through the reactor. For a decomposition reaction, the rate of reaction is proportional to some power of the concentration of .

  8. Reaction (physics) - Wikipedia

    en.wikipedia.org/wiki/Reaction_(physics)

    The terms 'action' and 'reaction' have the misleading suggestion of causality, as if the 'action' is the cause and 'reaction' is the effect. It is therefore easy to think of the second force as being there because of the first, and even happening some time after the first.

  9. Action (physics) - Wikipedia

    en.wikipedia.org/wiki/Action_(physics)

    The action corresponding to the various paths is used to calculate the path integral, which gives the probability amplitudes of the various outcomes. Although equivalent in classical mechanics with Newton's laws, the action principle is better suited for generalizations and plays an important role in modern physics. Indeed, this principle is ...