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happyphysics.com Physics Lecture Resources Prof. Mineesh Gulati Head-Physics Wing Happy Model Hr. Sec. School, Udhampur, J&K Website: happyphysics.com

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Ch 2 Motion Along A Straight Line

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2.1 Displacement, Time and Average Velocity Average velocity during this time interval as a vector quantity whose x-component is the change in x divided by the time interval Average velocity during this time interval as a vector quantity whose x-component is the change in x divided by the time interval P1 P2 X1 X2

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x-t graph P1 P2 t1t2 x2 x1 Slope = average velocity

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Instantaneous Velocity Instantaneous velocity is the velocity at any specific instant of time or specific point along the path Instantaneous velocity is the velocity at any specific instant of time or specific point along the path © 2005 Pearson Education

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Velocity on x-t graph P1 Slope tangent = instantaneous velocity t x © 2005 Pearson Education

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A V>0 +x B V>0 +X but >x at pt A C V=0 at rest D V<0 -x E v<0 -x Slowly than D © 2005 Pearson Education

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Ch2.3 Average and Instantaneous Acceleration Average acceleration Average acceleration Instantaneous velocity Instantaneous velocity © 2005 Pearson Education

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Finding acceleration on v-t graph P1 P2 t1t2 v2 v1 Slope = average acceleration © 2005 Pearson Education

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A V>0 a>0 +x B V>0 a=0 +X but >x at pt A V=0 a<0 at rest D V<0 a=0 -x E v 0 -x Slowly than D C © 2005 Pearson Education

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2.4 Motion with constant Acceleration CONSTANT ACCELERATION © 2005 Pearson Education

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Area = a x t Area = v x -v ox © 2005 Pearson Education

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2.5 Freely Falling Bodies Falls freely mean has a constant acceleration due to gravity. © 2005 Pearson Education

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Ch2.6 Velocity and position by integration ΔtΔt t1t2 a av-x axax © 2005 Pearson Education

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Summary

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Free fall is a case of motion with constant acceleration. The magnitude of the acceleration due to gravity is a positive g. The acceleration of a body in free fall is always downwards. © 2005 Pearson Education

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END Visit: happyphysics.com For Physics Resources

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