Given vectors OA and OB calculate vector AB
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So the teacher said it's like this OB - OA = AB and I don't understand it. Why aren't we doing this instead: OA - OB? aren't they the same thing?
vectors
asked Jan 18 at 17:02
ythhtrgythhtrg
383
$endgroup$
add a comment |
$begingroup$
So the teacher said it's like this OB - OA = AB and I don't understand it. Why aren't we doing this instead: OA - OB? aren't they the same thing?
vectors
asked Jan 18 at 17:02
ythhtrgythhtrg
383
$endgroup$
1
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Order matters, since vectors have a direction. Convince yourself that $vec {OA}+vec {AB}=vec {OB}$ which is equivalent to what the teacher said.
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– lulu
Jan 18 at 17:04
add a comment |
$begingroup$
So the teacher said it's like this OB - OA = AB and I don't understand it. Why aren't we doing this instead: OA - OB? aren't they the same thing?
vectors
asked Jan 18 at 17:02
ythhtrgythhtrg
383
$endgroup$
So the teacher said it's like this OB - OA = AB and I don't understand it. Why aren't we doing this instead: OA - OB? aren't they the same thing?
vectors
vectors
asked Jan 18 at 17:02
ythhtrgythhtrg
383
asked Jan 18 at 17:02
ythhtrgythhtrg
383
asked Jan 18 at 17:02
ythhtrgythhtrg
383
asked Jan 18 at 17:02
ythhtrgythhtrg
383
asked Jan 18 at 17:02
ythhtrgythhtrg
383
383
1
$begingroup$
Order matters, since vectors have a direction. Convince yourself that $vec {OA}+vec {AB}=vec {OB}$ which is equivalent to what the teacher said.
$endgroup$
– lulu
Jan 18 at 17:04
add a comment |
1
$begingroup$
Order matters, since vectors have a direction. Convince yourself that $vec {OA}+vec {AB}=vec {OB}$ which is equivalent to what the teacher said.
$endgroup$
– lulu
Jan 18 at 17:04
1
1
$begingroup$
Order matters, since vectors have a direction. Convince yourself that $vec {OA}+vec {AB}=vec {OB}$ which is equivalent to what the teacher said.
$endgroup$
– lulu
Jan 18 at 17:04
$begingroup$
Order matters, since vectors have a direction. Convince yourself that $vec {OA}+vec {AB}=vec {OB}$ which is equivalent to what the teacher said.
$endgroup$
– lulu
Jan 18 at 17:04
add a comment |
1 Answer
1
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$begingroup$
Draw a diagram, labeling three points O, A, and B, and draw the vectors between them. In particular, remember that the vector OA goes from O to A, and remember that -OA is from A to O. Then draw out OB - OA, and OA - OB and observe whether they're the same thing or not.
answered Jan 18 at 17:04
Calvin GodfreyCalvin Godfrey
648412
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add a comment |
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$begingroup$
Draw a diagram, labeling three points O, A, and B, and draw the vectors between them. In particular, remember that the vector OA goes from O to A, and remember that -OA is from A to O. Then draw out OB - OA, and OA - OB and observe whether they're the same thing or not.
answered Jan 18 at 17:04
Calvin GodfreyCalvin Godfrey
648412
$endgroup$
add a comment |
$begingroup$
Draw a diagram, labeling three points O, A, and B, and draw the vectors between them. In particular, remember that the vector OA goes from O to A, and remember that -OA is from A to O. Then draw out OB - OA, and OA - OB and observe whether they're the same thing or not.
answered Jan 18 at 17:04
Calvin GodfreyCalvin Godfrey
648412
$endgroup$
add a comment |
$begingroup$
Draw a diagram, labeling three points O, A, and B, and draw the vectors between them. In particular, remember that the vector OA goes from O to A, and remember that -OA is from A to O. Then draw out OB - OA, and OA - OB and observe whether they're the same thing or not.
answered Jan 18 at 17:04
Calvin GodfreyCalvin Godfrey
648412
$endgroup$
Draw a diagram, labeling three points O, A, and B, and draw the vectors between them. In particular, remember that the vector OA goes from O to A, and remember that -OA is from A to O. Then draw out OB - OA, and OA - OB and observe whether they're the same thing or not.
answered Jan 18 at 17:04
Calvin GodfreyCalvin Godfrey
648412
answered Jan 18 at 17:04
Calvin GodfreyCalvin Godfrey
648412
answered Jan 18 at 17:04
Calvin GodfreyCalvin Godfrey
648412
answered Jan 18 at 17:04
Calvin GodfreyCalvin Godfrey
648412
648412
add a comment |
add a comment |
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$begingroup$
Order matters, since vectors have a direction. Convince yourself that $vec {OA}+vec {AB}=vec {OB}$ which is equivalent to what the teacher said.
$endgroup$
– lulu
Jan 18 at 17:04