Physics Review Question Unit: Mechanics Year: 1994 Question#: 4 Question: Which is a vector quantity? (1 ) distance (2 ) time (3 ) speed (4 ) acceleration What is this question really asking? Explanation by: Liz M. [ Return to question menu ] Answer 1 distance INCORRECT This answer is incorrect because in order for something to be a vector quantity it must be described by both magnitude and direction. Distance is only described by magnitude; it is a scalor quantity. return to top Answer 2 time INCORRECT This answer is incorrect because in order for something to be a vector quantity it must be described by both magnitude and direction. Time is a scalor quantity it is only measured by magnitude. return to top Answer 3 speed INCORRECT This answer is incorrect because in order for something to be a vector quantity it must be described by both magnitude and direction. Speed is a scalor quantity; it is only described by magnitude. return to top Answer 4 acceleration CORRECT ...because a vector quantity has magnitude and direction. Acceleration is a vector quantity because it is not only described by number with appropriate units but also by direction. It is a change in velocity/time. return to top What's this question really asking? The question is asking if the student knows the definition of a vector. return to top |
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