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PHY 121
Your 'cq_1_19.3' report has been received. Scroll down through the document to see any comments I might have inserted, and my final comment at the end.
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An object moving in the direction 120 degrees (as measured counterclockwise to the positive x axis) encounters a net force whose direction is 270 degrees.
Sketch the force and its component along the line of motion, as well as its component perpendicular to the line of motion.
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I made an traditional x-y axis. Going into the 2nd quadrant, I sketched a ray at about 120 degrees. 270 degrees is straight down the y axis in the negative direction starting at zero. But this isn't making sense. So I moved it over parallel, but now I don't think it's 270 degrees.
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Your first picture was correct.
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Suppose you are facing in the direction of motion. Do you perceive the component of the force along the line of motion to be forward or backward? It this component in the direction of motion or opposite to the direction of motion?
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I would think that this would have something to do with velocity, however, just looking at what I've drawn (which probably isn't correct) it seems to me that the 120 degree trajectory will get knocked vertically when it by the 270 degree force,
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If you are facing forward in the direction of the 120 degree vector, and a force pulls on you in the direction of the 270 degree vector, that force must do one of the following, as you perceive it:
The force must either
1. pull only in the direction opposite the one you are facing (i.e., backwards)
2. pull only in the direction you are facing (i.e., forward)
3. pull back and to the right
4. pull back and to the left
5. pull forward and to the right
or
6. pull forward and to the left
Which does it do?
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Will the object speed up, slow down or maintain a constant speed?
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If you are facing in the direction of motion, then the line perpendicular to the direction of motion will run to your right and to your left. Is the component of the force perpendicular to the line of motion directed to the right or to the left?
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Will the object veer to the right, to the left or maintain straight-line motion?
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Which is greater in magnitude, the component of the force along the line of motion or the component perpendicular to the line of motion?
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Your original picture sounds good.
I've inserted a question which, if you answer it, should get you oriented to the situation.
&#Please see my notes and submit a copy of this document with revisions, comments and/or questions, and mark your insertions with &&&& (please mark each insertion at the beginning and at the end).
Be sure to include the entire document, including my notes. &#
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