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Published byAnnabel Bishop Modified over 9 years ago
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Chapter 3 Motion (Ewen et al. 2005) Objectives: Distinguish between speed and velocity Use vectors to illustrate and solve velocity problems.
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Motion can be defined as an object’s change in position. How quickly and object changes its position is its speed—distance traveled per unit of time. Units: mi/h, km/h, m/s, or ft/s
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Velocity of an object is the rate of motion in a particular direction. The time rate of change of an object’s displacement. A vector quantity that give the direction of travel and the distance traveled per unit of time Figure 4.2 The velocity, distance, and time for a car traveling at a constant velocity of 10 m/s to the right is shown in 1-s intervals. s = displacement v avg = average velocity or speed t = time Units?
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Find the average speed of an automobile that travels 160 km in 2.0 h.
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An airplane flies 3500 mi in 5.00 h. Find its average speed.
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Find the velocity of a plane that travels 600 km due north in 3 h 15 min.
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A plane is flying due north (90 o ) at 264 km/h. Suddenly there is a wind from the east (180 o ) at 55.0 km/h. What is the plane’s new velocity with respect to the ground in standard position? Note: Wind directions are given from the direction the wind is coming from, not the direction it is actually blowing. For example, a north wind is actually coming from the north but is actually moving southward.
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A plane is flying northwest (at 135 o ) at 135 km/h. Suddenly there is a wind from 30.0 o south of west (at 30.0 o ) at 65.0 km/h. What is the plane’s new velocity with respect to the ground in standard position?
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