# lecture 3 - Lecture 3 Time and position Distance and...

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1 Lecture 3 Time and position Distance and displacement Velocity and speed Acceleration

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2 t 1 would represent an instant of time as read from a clock. The difference between two instants of time is a time interval: t = t 2 – t 1 . Time
3 Position, distance, and displacement The position of a body is measured with respect to the origin of a coordinate system (or other reference point). 0 x 2 0 x 1 The location of the red ball differs in the two shown coordinate systems.

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4 The displacement (in 1-D) is defined as r r 2 r 1 , this is the net change in position. The distance traveled is | r | | r 2 r 1 | assuming no turn around.
5 1 s t 2 n d 3 r d 4 t h 5 t h 6 t h 7 t h 8 t h A B C D E 9 t h A B The figure below represents a street map with avenues A, B, C, D, and E running east and west with streets 1 st through 9 th running north and south. Each intersection is 0.500 km apart. In this figure east is to the right and north is toward the top of the page. Ignore the width of the roads.

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