Adding Scalar Multiples of Vectors Graphically

  • Thread starter Turtlie
  • Start date
  • #1
6
0

Homework Statement


Draw the vector C = 1.5A -3B
(Mastering Physics problem)
A is 4.5 and B is 1.0

The Attempt at a Solution


I've tried it 4 times and still can't do it. I've looked at some sites but I guess I just don't understand it. I've heard of the head to tail method, or something similar, but I either did it wrong or didn't understand it.

I got the first one right, but I've never done any with the different-angled vectors (aside from East/West, North/East)

Oops, picture would be helpful.
2jsbvm.jpg
 
Last edited:

Answers and Replies

  • #2
Delphi51
Homework Helper
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Make A 1.5 times as long.
Make B 3 times as long and in the opposite direction to form -3B.
Copy the extended -3B so that it begins at the end of 1.5A. The total is the new vector going from the beginning of 1.5A to the end of the relocated -3B. Looks like about 9 to the right and 3 up.
 
  • #3
6
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1. Make A 1.5 times as long.
2. Make B 3 times as long and in the opposite direction to form -3B.
3. Copy the extended -3B so that it begins at the end of 1.5A.
4. The total is the new vector going from the beginning of 1.5A to the end of the relocated -3B. Looks like about 9 to the right and 3 up.

2lm2cxy.jpg


Is that right? Not completely sure about four though :confused:
 
  • #4
Delphi51
Homework Helper
3,407
11
Looks good! Ignore 4. Count your answer from the beginning of 1 to the tip of 3. It is 9 squares to the right and 4 squares up. Often written as (4,3).
 
  • #5
6
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Wait so which arrow would be the answer? The one that I labeled as 3?

Edit: Well 3 isn't the answer. I tried that one so now I have like 1 try left.
 
Last edited:

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