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Motion diagrams and video point questions

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PHY111/21VPre Laboratory Problems: Motion Diagrams and VideoPoint 1. Which graph best describes the "horizontal distance traveled" (vertical axis) versus elapsed" (horizontal axis) for a car traveling at a constant speed of 60 miles down the letter and then justify your answer in a complete sentence the our? Write per h Horizontal Position of Car (in miles) Answer 240 -T- 180- Justify: C,イ 日apsed Time 0 1 2 3 4 2. (a) Sketch the speed in miles per hour (mi/h) versus time in hours for Problem #1. Explain Speed of Car (miles/hr) 120 your answer using v 60 30- Elapsed Time (in hours) Nt (b) Sketch the acceleration in miles per hour per hour (mi / h) versus time for Problem #1. Explain your Acceleration of Car (miles /hr/hr) 120 , T. Av answer using a 60 Ar 3. (a) Sketch the x-position versus time for a ball that starts to roll from rest at the top of the incline. Start fromrest teos 16 1x position (m 12 0 4 8 12 16 Note: The time between each image is one second 0 t (s) (b) Is the velocity of the ball constant? Explain. 0 1 2 34 (c) Is the acceleration of the ball zero? Explain.

Answer 1

Constant Speed = 60 mi/h nu = dx/dt = C integral dx = integral C dt x alpha t B graph Position of car alpha time (a) nu = constant = 60 mi/h (b) a = dv/dt = d(C)/dt = 0 a = 0 (a) (b) no, not constant it is increasing as we can see slope of x vs t graph increasing. (c) no acceleration is not zero, as velocity is not constant.