Information AboutImpulse |
| CATEGORIES ABOUT IMPULSE | |
| physical quantity | |
| classical mechanics | |
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In Classical Mechanics , the ''impulse of a force'' is the product of the force and the time during which it acts. Although momentum is conserved within a closed system, individual parts of a system can undergo changes in momentum. Impulse has the same units and dimensions as momentum ( Kg M/s or N - S ). The impulse of a time-varying force is calculated as the Integral of Force with respect to Time : : :::where ::::I is impulse, ::::F is the force, :::: ''t'' is an Infintesimal amount of time. In the presence of a constant Net Force , impulse is equal to the Average impulse: : :::where ::::''m'' is the mass of the object, ::::Δv is the change in velocity, ::::F is the ''constant'' net force applied (in order to change the velocity), and :::: is the time interval over which the force is applied. Using the definition of force yields: : : : 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 change in an object's momentum caused by a fast-acting force. This type of impulse is often ''idealized'' so that the change in momentum 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 computations, such as computing the effects of ideal collisions, especially in game Physics Engine s. SEE ALSO
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