zdistance_speed_velocity_P195 2010

# zdistance_speed_velocity_P195 2010 - Chapter 2: Straight...

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1 Chapter 2: Straight Line Kinematics. Motion in 1-Dimension. Even if you never had a physics class before, you probably know an equation for speed.

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2 time covered distance = speed actually it’s time covered distance = speed average time covered distance = s You walk from A to B to C in 10 seconds. We let x describe your position on the road. A x = 0 m At t = 0 C x = 4 m B x = 10 m
3 For the 10-second trip A –> B –> C: What is the total distance, d? d = _______ What is the average speed s ? A x = 0 m At t = 0 C x = 4 m B x = 10 m

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4 hour miles s m s m s 5 . 3 6 . 1 10 16 t d time covered distance = = = = Distance d and speed s are SCALAR quantities. A scalar is a quantity that has only magnitude (size). It does not have a direction. Ex: time, mass, \$\$ A x = 0 m At t = 0 C x = 4 m B x = 10 m east west
5 We define your displacement, ∆x , as your ‘change in position’. ∆x = x final - x initial For ABC: ∆x = 4m - 0m = 4m. The ‘+’ sign tells us that the displacement is to the right (east). Displacement is a VECTOR quantity. A vector is a quantity that has both magnitude and direction . A x = 0 m At t = 0 C x = 4 m B x = 10 m east west

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6 Displacement, ∆x = 4 m Or ∆x = 4 m east m = 4 x Your average velocity v is your ‘ rate of change of position’: hour miles s m s m v 9 . 0 4 . 0
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## This note was uploaded on 09/09/2011 for the course PHYS 195 taught by Professor Staff during the Spring '11 term at Mesa CC.

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zdistance_speed_velocity_P195 2010 - Chapter 2: Straight...

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