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# L5 - Last&me Introduced the concept of acceleration...

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Last &me ….. L5 F 1/22/10 Physics 2010 1 Introduced the concept of acceleration – non-zero when velocity is changing. Recall: = slope of an x vs. t plot Similarly: = slope of a v vs. t plot Confusion: sign of acceleration. The sign of acceleration is not necessarily the same as the sign of velocity. v = Δ x Δ t = displacement elapsed time a = Δ v Δ t = change in velocity elapsed time

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L5 F 1/22/10 Physics 2010 2 Only three constant slopes: positive, zero, negative.
Last &me ….. L5 F 1/22/10 Physics 2010 3 Introduced the concept of acceleration – non-zero when velocity is changing. Recall: = slope of an x vs. t plot Similarly: = slope of a v vs. t plot Confusion: sign of acceleration. The sign of acceleration is not necessarily the same as the sign of velocity. v = Δ x Δ t = displacement elapsed time a = Δ v Δ t = change in velocity elapsed time

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Last &me ….. L5 F 1/22/10 Physics 2010 4 v = Δ x Δ t = displacement elapsed time a = Δ v Δ t = change in velocity elapsed time
Last &me ….. L5 F 1/22/10 Physics 2010 5 A C B 2 4 a = Δ v Δ t = change in velocity elapsed time

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L5 F 1/22/10 Physics 2010 6 A C B 2 4 a = Δ v Δ t = change in velocity elapsed time Assuming positive is up, between points A and B acceleration is A) positive B) negative C) changes sign D) neither.
L5 F 1/22/10 Physics 2010 7 A C B 2 4 a = Δ v Δ t = change in velocity elapsed time Assuming positive is up, between points B and C acceleration is A) positive B) negative C) changes sign D) neither.

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L5 - Last&me Introduced the concept of acceleration...

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