Physics for Scientists and Engineers 3E by R. Knight, C1E&P8

Figure Ex1.8 shows the first three points of a motion diagram. Is the object’s average speed between points 1 and 2 greater than, less than, or equal to its average speed between 0 and 1? Explain how you can tell

Use Tactics Box 1.3 to find the average acceleration vector at point 1. Draw the completed motion diagram, showing the velocity vectors and acceleration vector.

Figure Ex1.8 for Physics for Scientists and Engineers by Randall Knight — Figure Ex1.8

Solution:

Part a

Let $\displaystyle \vec{v_0}$ be the velocity vector between points 0 and 1 and $\displaystyle \vec{v_1}$ be the velocity vector between points 1 and 2. Speed v₁ is greater than v₀ because more distance is covered in the same interval of time.

Part b

To find the acceleration, use the method of Tactics Box 1.3:

Physics for Scientists and Engineers Answer for Problem 1.8B

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