![]() ![]() In these cases we may only be able to deduce the magnitude of the impulse as a whole via the observed change in momentum of the body. ![]() In instances of impulsive forces, it is often difficult to measure the exact magnitude of the force or the time. This is an instance where we have very large forces acting over a very short time frame. In many cases, we will discuss impulsive forces. The direction of the impulse vector will be the direction of the force vector and the units will be a force times a time (Newton Seconds or Pound Seconds for example). If the force is not constant, we simply integrate the force function over the set time period. For a force with a constant magnitude, we can find the magnitude of the impulse by multiplying the magnitude of the force by the time that force is exerted. The concept of an impulse in it's most basic form is a force integrated over a time. Impulses and velocities are both vector quantities, giving us the basic equation below. The impulse is usually denoted by the variable J (not to be confused with the polar moment of inertia, which is also J) and the momentum is a body's mass times it's velocity. Generally this method is called the Impulse-Momentum Method, and it can be boiled down to the idea that the impulse exerted on a body over a given time will be equal to the change in that body's momentum. The concepts of Impulse and Momentum provide a third method of solving kinetics problems in dynamics.
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