02_forcevstime - Lesson 2 Impulse Graphs So far we've...

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Lesson 2: Impulse Graphs So far we've implied some things about what is constant and what can change in the impulse formula F Δt = m Δv. We look at situations where we expect the mass of the object will stay constant . The velocity will change , and that's why we put a delta in front of it. Time is changing (sort of) as we measure it over a period of time. Force must be a constant . We assume that the force being exerted on the object was always the same, causing a constant acceleration. If we are looking at a simple impulse question (where the force is constant), we can figure out exactly what we can interpret from a graph. Later this may help us to figure out a more complicated question, like if the force changes. The following graph is an example of one of those simple situations where the force remains constant during the entire time. If we look at what the slope might represent, we get... slope = rise run slope = F t Since nothing in the impulse formula can be rearranged to give us force over time, the slope doesn't mean anything to us in this situation.
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