not changingLearning Goal:To understand the distinction between velocity andacceleration with the use of motion diagrams.Previous AnswersIn common usage, velocity and acceleration both canimply having considerable speed. In physics, they aresharply defined concepts that are not at all synonymous.Distinguishing clearly between them is a prerequisite tounderstanding motion. Moreover, an easy way to studymotion is to draw a motion diagram, in which the positionof the object in motion is sketched at several equallyspaced instants of time, and these sketches (ornapshots) are combined into one single picture.CorrectWhile the ball is in free fall, the magnitude of its velocity is increasing, so the ball isaccelerating.Part BIn this problem, we make use of these concepts to studythe motion of a power ball. This discussion assumes thatwe have already agreed on a coordinate system fromwhich to measure the position r (t) (also called theSince the length of v is directly proportional to the length of Ar, the vector connecting each dot to thenext could represent velocity vectors as well as displacement vectors, as shown in the figure here(Figure 2). Indicate whether the velocity and acceleration of the ball are, respectively, positive (upward),negative, or zero.position vector) of objects as a function of time. Let v(t)and a(t) be velocity and acceleration, respectively.Use P, N, and z for positive (upward), negative, and zero, respectively. Separate the letters forvelocity and acceleration with a comma.> View Available Hint(s)Figure1 of 4SubmitReleasePart CNow, consider the motion of the power ball once it bounces upward. Its motion diagram is shown in thefigure here (Figure 3). Indicate whether the magnitude of the velocity of the ball is increasing,decreasing, or not changing.> View Available Hint(s)increasingdecreasingGroundO not changing

The velocity at any point is √(2gh). So, velocity is positively increased.(P)

Part B Since the length of v is directly proportional to the length of AF, the vector connecting each dot to the next could represent velocity vectors as well as displacement vectors, as shown in the figure here (Figure 2). Indicate whether the velocity and acceleration of the ball are, respectively, positive (upward negative, or zero. Use P, N, and z for positive (upward), negative, and zero, respectively. Separate the letters for velocity and acceleration with a comma. > View Available Hint(s) Submit Part C Now, consider the motion of the power ball once it bounces upward. Its motion diagram is shown in the figure here (Figure 3). Indicate whether the magnitude of the velocity of the ball is increasing, decreasing, or not changing. > View Available Hint(s) O increasing decreasing O not changing

Part B Since the length of v is directly proportional to the length of AF, the vector connecting each dot to the next could represent velocity vectors as well as displacement vectors, as shown in the figure here (Figure 2). Indicate whether the velocity and acceleration of the ball are, respectively, positive (upward negative, or zero. Use P, N, and z for positive (upward), negative, and zero, respectively. Separate the letters for velocity and acceleration with a comma. > View Available Hint(s) Submit Part C Now, consider the motion of the power ball once it bounces upward. Its motion diagram is shown in the figure here (Figure 3). Indicate whether the magnitude of the velocity of the ball is increasing, decreasing, or not changing. > View Available Hint(s) O increasing decreasing O not changing

Glencoe Physics: Principles and Problems, Student Edition

1st Edition

ISBN:9780078807213

Author:Paul W. Zitzewitz

Publisher:Paul W. Zitzewitz

Chapter2: Representing Motion

Section: Chapter Questions

Problem 66A

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