Information AboutImpulse |
| CATEGORIES ABOUT IMPULSE | |
| physical quantity | |
| classical mechanics | |
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In Classical Mechanics , an impulse is defined as the Integral of a Force with respect to Time : : where :I is impulse (sometimes marked '''J'''), :F is the force, and : ''dt'' is an Infinitesimal amount of time. A simple derivation using Newton's Second Law yields: : : : As a result, an impulse may also be regarded as the change in Momentum of an object to which a force is applied. The impulse may be expressed in a simpler form when both the force and the mass are constant: : where :F is the ''constant'' total net force applied, : is the time interval over which the force is applied, m :Δv is the change in velocity produced by the force in the considered time interval, and :mΔv = Δ(mv) is the change in linear momentum. However, it is often the case that one or both of these two quantities vary. In the technical sense, impulse is a physical quantity, not an event or force. However, the term "impulse" is also used to refer to a fast-acting force. This type of impulse is often ''idealized'' so that the change in momentum produced by the force happens with no change in time. This sort of change is a Step Change , and is not physically possible. However, this is a useful model for certain purposes, such as computing the effects of ideal collisions, especially in game Physics Engine s. Impulse has the same units and dimensions as momentum ( Kg M/s or N · S = Huygens Hy). SEE ALSO
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