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### Course: Algebra (all content)>Unit 19

Lesson 1: Vector basics

# Recognizing vectors practice

Try two questions that make sure you understand that vectors have magnitude and direction.

## Problem 1

Which of the following can represent a vector?

## Problem 2

Which of the following can be modeled by a vector?

## Want to join the conversation?

• i don't understand whether the time is a scalar or vectoral magnitude. if we can say it is vectoral, why do we get a scalar magnitude when we divide the distance (not displacement) by the time?
• You are seeing time according to classical physics. If we see time according to the theory of relativity time is vector whose direction is towards future.
• Is Force a scalar or a vector quantity ?
• I think Force should be a vector, since it possess both a scalar and a direction.
• The answer choices in problem one confuse me. Why isn't the length of the distance between the points (0,0) and (2,7) considered a vector? Is it required to be a line of some sort in order to be a vector?
• Vectors need both a magnitude (distance) and direction.
If you just know the length, you have the magnitude but no direction. The answer options 2 and 4 tell you where to start from, so they give both the distance and direction.
Hope this helps.
• is there a tip or something that can help you know about if its a vector or not
• The definition of a vector contains tips. If it has a direction AND magnitude/ size, then it is a VECTOR.
• it was tricky , I clearly understood that vectors have sizes and specified directions. so I wanted to test myself for this particular test so I chose A and B because in answer A we have the distance between two objects and on the pool table which I counted as a direction based on what I learnt in the English language that to tell on the right or on the left or
above etc . also,I used the same logical thinking to answer B

for C it was obvious that it didn't make and sense.however, for D it states only the movement of the airplane but not at any directions did the airplane moved to the left or to the right or was it landing gradually so I didn't count it as a correct version of answer

thank you for your help and support I mere want to comment
• Well, the airplane is assumed to have a direction and a velocity/acceleration (or some value of interest that can be associated with its direction) so it meets the criterion for a vector. It doesn't matter which way it is moving or if it is landing or taking off.
• Why is electric current scalar when it has a direction?
• This might be complicated for you IF you have not yet learnt vector laws. But anyway, there is a law called the Parallelogram Law Of Vectors . If a quantity obeys this rule and the other rules for vectors, it will be considered a vector quantity. But electric current was tested and it did not obey this rule. So, even if it had a magnitude and direction, it was not considered a vector.
• How can the movement of an aeroplane be considered as a vector?
• The movement of an airplane can be considered a vector, because an airplane always has a speed (or magnitude) and has a movement (or direction). Technically all real world movements can be considered a vector, because a force is always applied (the magnitude {2N for example}) and movement always results in a change of location (which is always in a direction {the left for example})