P2207_fall10_lecture2pdf

# P2207_fall10_lecture2pdf - 2 t(s 1 4 2 6 v t = 6s = A 2 m/s...

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© Matthias Liepe, 2010

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Today: Describing 1-D motion Acceleration Visualizing motion, reading graphs
Which of the following v - t graphs best describes the horizontal motion of a foot relative to the ground during ordinary walking? v t v t v t v t (A) (B) (C) (D) 0 0 0 0

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An object moves along the x axis as shown below. At what time is v = 0 ? t x t 1 t 5 t 4 t 3 t 2 A. t1 B. t2 C. t3 D. t4 E. t5
t x t 1 t 5 t 4 t 3 t 2 An object moves along the x axis as shown below. At what time does the velocity v has its largest positive value? A. t1 B. t2 C. t3 D. t4 E. t5

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t x t 1 t 5 t 4 t 3 t 2 An object moves along the x axis as shown below. At what time is the speed of the object the largest ? A. t1 B. t2 C. t3 D. t4 E. t5
t x t 1 t 5 t 4 t 3 t 2 An object moves along the x axis as shown below. At what time is the object's speed decreasing ? A. t1 B. t2 C. t3 D. t4 E. t5

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At t =0 the velocity of a particle is 2 m/s. If its acceleration a (t) is as shown, what is its velocity at t = 6s ? a (m/s

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Unformatted text preview: 2 ) t (s) 1 4 2 6 v ( t = 6s) =? A. 2 m/s B. 4 m/s C. 6 m/s D. 7 m/s E. 8 m/s 0 v (m/s) t (s) 5 2 1 3 At t =0 the position of a particle is x =-5 m. If its velocity v ( t ) is as shown, what is its position at t=3 s ? x ( t =3s) = ? A. -5 m B. 0 m C. 2.5 m D. 5 m E. 7.5 m 0 -5 Transfer out thinking among: When a traffic light turns green at t =0, a car moves forward from rest at x =0 and eventually comes to a stop at the next red light at t =t s . Which of the following x-t graphs could describe the motion of the car? (Pick one.) t x (A) t s t x (D) t s t x (B) t s t x (C) t s 0 0 0 0 Which of the following x-t graphs could describe the motion of a simple pendulum? t x (A) (D) t x (C) t x (B) t x Ultrasonic ranger: sends very short pulses of ultrasound, then listens for time of echo Pendulum: Measuring distance using echos of reflected ultrasound...
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P2207_fall10_lecture2pdf - 2 t(s 1 4 2 6 v t = 6s = A 2 m/s...

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