lecture02

lecture02 - Chapters 1 and 2: Motion on a straight line...

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Page Chapters 1 and 2: Motion on a straight line Chapters 1 and 2: Motion on a straight line z Displacement z Velocity (average and instantaneous) (average and instantaneous) z Acceleration Acceleration z Special case of Special case of constant constant acceleration acceleration Í gravity g=9.8 m/s gravity g=9.8 m/s 2 Kinematics Kinematics z Location and motion of objects: kinematics z Kinematic Variables : Í Measured with respect to a reference frame (x-y axis) Í Measured using coordinates (having units) Í Many kinematic variables are vectors vectors , which means they have a direction direction as well as a magnitude magnitude z examples of kinematic variables: Í displacement vector Í velocity vector Í acceleration vector
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Page Position and Displacement Position and Displacement In 1-D, position at time t 1 is usually denoted x 1 = x (t 1 ) t x Δ x Δ t t 1 x 1 t 2 x 2 Later, position at time t 2 is usually denoted x 2 = x (t 2 ) Displacement is a vector. In 1-D, its direction is indicated by the sign: + or The displacement Δ x in time interval Δ t=t 2 –t 1 is Δ x=x(t 2 ) – x(t 1 ) = x 2 –x 1 1 2 x x x = Δ The positon-vs-time graph: x(t) Displacement Displacement Examples Displacement Examples Δ x= x 2 –x 1 = 30 m – 10 m = +20 m 10 20 30 40 x (m) y Δ x= x 2 –x 1 = 10 m – 30 m = –20 m 10 20 30 40 x (m)
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This note was uploaded on 09/26/2010 for the course PHYS 021 taught by Professor Dick during the Spring '08 term at GWU.

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lecture02 - Chapters 1 and 2: Motion on a straight line...

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