8-27-1DKinematics

# 8-27-1DKinematics - Chapter 2 1D Kinematics When an object...

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When an object moves along a line from an initial position x i to position x f , the Displacement is Δ x=x f -x i . Distance is the total length of travel. This is always positive. x i x f x (+) x i x f x ( - ) x =4.3mi x=- 4.3mi This can be either positive or negative . Distance for either way: 4.3mi How about the entire trip? Total displacement = 4.3 + (-4.3) = 0 Total distance traveled = 4.3 + 4.3 = 8.6 mi Chapter 2 1D Kinematics A jogger’s training session What is the displacement from the origin to t=70 minutes? What distance has been covered at t=70 minutes? t (minutes) x (miles) 00 30 3 50 3.5 70 1.5 90 1 100 -1 110 0 -1 3+0.5+2 = 5.5 miles x i = 0 x f = 1.5miles f i =1.5miles – 0 = 1.5 miles x(miles) t(min)

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Average Velocity The average velocity of an object that moves from position x i at time t i to position x f at time t f is t x t t x x v i f i f AV Δ Δ = = What is the average velocity of our jogger for the whole training session ? 1 2 3 4 20 40 60 80 120 -1 Can be positive or negative min / 0 0 min 110 0 0 mile mile = = What is the average velocity after 70 minutes (to the end)?
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## 8-27-1DKinematics - Chapter 2 1D Kinematics When an object...

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