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Unformatted text preview: t line becomes a tangent when Δt t (s) approaches zero. • Interpret the the graph on the leK. Accelera#on In real life, examples of constant veloci;es are rare. So, we must deal with changing velocity. Is there a quan#ty that quan#ﬁes how velocity changes with #me? Yes; accelera#on is that very quan#ty. Accelera;on is the ;me rate of change of velocity. Accelera#on is a signed quan#ty: posi#ve if velocity increases with #me and nega#ve if velocity decreases with #me. We will learn that accelera#on is a vector quan#ty. As in the case of velocity, we can talk about average accelera#on, constant accelera#on, and instantaneous accelera#on. Δvx vxf − vxi ax , avg = = Δt Δt constant accelera;on (ax does not change during Δt): vxf − vxi ax = Δt instantaneous accelera;on: Δx dvx ax = lim = Δt → 0 Δt dt
average accelera;on (ax changes during Δt): Mo#...
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 Spring '08
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