![]() ![]() The collision would change the halfback's speed and thus his momentum. Consider a football halfback running down the football field and encountering a collision with a defensive back. ![]() In a collision, objects experience an impulse the impulse causes and is equal to the change in momentum. The impulse experienced by the object equals the change in momentum of the object. The result of the force acting for the given amount of time is that the object's mass either speeds up or slows down (or changes direction). The law can be expressed this way: In a collision, an object experiences a force for a specific amount of time that results in a change in momentum. The equation is known as the impulse-momentum change equation. The physics of collisions are governed by the laws of momentum and the first law that we discuss in this unit is expressed in the above equation. One focus of this unit is to understand the physics of collisions. The equation really says that the Impulse = Change in momentum In words, it could be said that the force times the time equals the mass times the change in velocity. To truly understand the equation, it is important to understand its meaning in words. This equation represents one of two primary principles to be used in the analysis of collisions during this unit. If both sides of the above equation are multiplied by the quantity t, a new equation results. When combined with the definition of acceleration (a = change in velocity / time), the following equalities result.
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