ch02 - Chapter 2 Kinematics in One Dimension Kinematics...

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Kinematics in One Dimension Chapter 2
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Kinematics deals with the concepts that are needed to describe motion. Dynamics deals with the effect that forces have on motion. Together, kinematics and dynamics form the branch of physics known as Mechanics.
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2.1 Displacement position initial = o x position final = x nt displaceme = - = o x x x
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2.1 Displacement m 0 . 2 = o x m 0 . 7 = x m 0 . 5 = x m 0 . 5 m 2.0 m 7.0 = - = - = o x x x
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2.1 Displacement m 0 . 2 = x m 0 . 7 = o x m 0 . 5 - = x m 0 . 5 m 7.0 m 2.0 - = - = - = o x x x
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2.1 Displacement m 0 . 2 - = o x m 0 . 7 = x m 0 . 5 = x ( 29 m 0 . 7 m .0 2 m 5.0 = - - = - = o x x x
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2.2 Speed and Velocity Average speed is the distance traveled divided by the time required to cover the distance. time Elapsed Distance speed Average = SI units for speed: meters per second (m/s)
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2.2 Speed and Velocity Example 1 Distance Run by a Jogger How far does a jogger run in 1.5 hours (5400 s) if his average speed is 2.22 m/s? time Elapsed Distance speed Average = ( 29 ( 29 ( 29 ( 29 m 12000 s 5400 s m 22 . 2 time Elapsed speed Average Distance = = =
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2.2 Speed and Velocity Average velocity is the displacement divided by the elapsed time. time Elapsed nt Displaceme velocity Average = t t t o o = - - = x x x v
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2.2 Speed and Velocity Example 2 The World’s Fastest Jet-Engine Car Andy Green in the car ThrustSSC set a world record of 341.1 m/s in 1997. To establish such a record, the driver makes two runs through the course, one in each direction, to nullify wind effects. From the data, determine the average velocity for each run.
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2.2 Speed and Velocity s m 5 . 339 s 4.740 m 1609 + = + = = t x v s m 7 . 342 s 4.695 m 1609 - = - = = t x v
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Speed and Velocity The instantaneous velocity indicates how fast the car moves and the direction of motion at each instant of time. t
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This note was uploaded on 02/20/2010 for the course PHYSC 210 taught by Professor Uscinski during the Summer '09 term at American.

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ch02 - Chapter 2 Kinematics in One Dimension Kinematics...

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