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Unformatted text preview: it y). Distance vs. Displacement: · Displacement is the shortest straight­line distance between two points. Displacement is a vector quant it y. · Velocit y is the rate of change of displacement with time. u r displacement d velocity= v = time t Total displacement Average velocity (v )= Total time · Instantaneous velocity is velocit y at a given time. Examples: 1. A man walks 3.0 mile north, then turns and walks back to his starting point. If it took him 2.5 hours to complete his walk, determine his average speed and average velocit y. d 3.0 mi+3.0 mi s= = = 2.4 mi/h t 2.5 h r d 0 mi v= = = 0 mi/h t 2.5 h 2. A jogger runs 200 m around a circular track in 25 seconds. What are his average speed and velocit y? 6 Physical Science 1 Chapter 2 ACCELERATION · Acceleration is the rate of change o f velocity with time. acceleration = a = D velocity D v = time t final velocity­initial velocity v f ­v 0 = time t · Acceleration occurs whenever there is a change in motion: Speeding up Slowing down Turning constant speed, changing velocity 7 Physical Science 1 Chapter 2 ACCELERATION vs. DECELERATION · When acceleration and velocity are in the same direction, speed increases. · When acceleration and velocity are in the opposite direction, speed decreases. · When acceleration and velocity are perpendicular to each other, turning occurs. 8 Physical Scienc...
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This document was uploaded on 03/18/2014 for the course CHEM 322 at Los Angeles Mission College.

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