I personally find that overly restrictive, since the concept of impulse can be applied well beyond that range (as the wikipedia page for impulse shows). They are referencing specifically a fast acting force/impact. They seem to be using this specific definition of impulse. However, this is a useful model for computing the effects of ideal collisions (such as in game physics engines). This sort of change is a step change, and is not physically possible. This type of impulse is often idealized so that the change in momentum produced by the force happens with no change in time. The term "impulse" is also used to refer to a fast-acting force or impact. Wikipedia seems to shed some light on this: Their version of "impulsive force" seems to be a specific definition, not the general physics definition. This means that the spring is changing the momentum of the object, and thus would be an impulsive force, as per the definitions I'm aware of. The velocity of the object connected to the spring is constantly changing, and it's mass remains the same. A trivial example is a object suspended by a spring which is first extended, and left alone to oscillate up and down. It's fairly trivial to show that over time, springs absolutely can change the momentum of an object they interact with.
Determining the impulse will tell you how much the momentum of the object changed over that time period. We meet the impulse at different situations in our daily life.To me, that definition seems too specific and non-intuitive compared to the general concept of an "impulse" in physics.Īn impulse in physics is typically defined as the integral of force over time. The SI unit of Specific impulse is meter per second. Specific impulse is equal to exhaust velocity.
Specific impulse is defined as the impulse per mass (or thrust per mass flow rate). Specific impulse is the determination of efficiency of rocket fuels. Impulse determines the changes of momentum. According to the impulse momentum theorem the change of momentum observed in an object is equal to the amount of impulse applied to the object. The impulse momentum theorem helps us to understand the relation between impulse and momentum. The impulse is equal to the product of the force and the time during which it acts. When the force is higher, more force is required to stop the body.įrom the above equation, when the velocity of a body changes, the momentum of the body also changes. Hence, from the above equation, we can define momentum as the product of mass and velocity. A body with momentum can be stopped when a force is applied against the direction of the body for some time. When a player has momentum, it means that they are moving and are difficult to stop. The word momentum is mainly used in sports. The direction of impulse is same as the direction of F⃗. Impulse is a vector quantity which means that it has both direction as well as magnitude. Thus, the SI unit of Impulse is Newton-second (N-s).
Impulse is a term which quantifies the overall effect of a force acting over time. Therefore, when a large force acts for a short time, momentum acts to produce a finite change in momentum of the body, and the force acting on the body is called force of impulse or impulsive force. Impulse FormulaĪn impulse of a force is the change in momentum produced by the force. Impulse is a quantity which defines the effect of a net force acting on an object.Ī large force which acts for a short time to generate a finite change in the momentum is known as an impulsive force.
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