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PHY 201
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.
answer/question/discussion: ->->->->->->->->->->->-> :
Sketched a line that with an angle of 120 degrees to the positive x-axis with a tail at the origin and the head on the other end. I then drew a line coming straight down with an arrow connecting to the arrow of the 120 degree vector.
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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?
answer/question/discussion: ->->->->->->->->->->->-> :
If I am traveling in the direction of motion (the 120 deg vector), I perceive the component of the force along the line of motion to be forward? It appears that we are going to have a head one collision. The force component is in the direction of motion.
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In a head-on collision typically the two velocity vectors are in the opposite direction, not the same direction. That would be the case here.
A vector at 270 degrees isn't exactly in the direction opposite a 120 degree vector, but the component of either vector in the direction of the other is opposite the other vector.
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• Will the object speed up, slow down or maintain a constant speed?
answer/question/discussion: ->->->->->->->->->->->-> :
Is the object the net force? I am not sure.
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The object is moving in the 120 deg direction.
The net force is in the 270 deg direction.
The object is not the net force. The net force acts on the object.
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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?
answer/question/discussion: ->->->->->->->->->->->-> :
To the right.
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You haven't explained or justified your conclusion. However see my note on the next question.
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• Will the object veer to the right, to the left or maintain straight-line motion?
answer/question/discussion: ->->->->->->->->->->->-> :
I am totally confused as to what I should be seeing here. I have a vector traveling in a line of motion at 120 degrees.
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The vector isn't traveling. Rather it indicates the direction in which the object is traveling, which I believe you understand but just didn't express quote correctly.
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The perpendicular line runs left to right of the motion. Then I have coming straight down at 270 deg a line representing the net_force.
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Good.
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If timed correctly, the would collide with each other. But I am not sure as to what you want me to be imagining right now.
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No timing is necessary. A force and a velocity don't collide.
The velocity simply 'is', and the force simply 'is'.
The question is what effect the force will have on the velocity.
Is the component of the force parallel to the object's velocity in the direction of the velocity, or opposite that direction (or is it perhaps zero)?
The direciton perpendicular to the object's velocity, as you say, runs right and left of the velocity vector. Is the component of the force in the direction perpendicular to the object's velocity to the right or to the left, or is it perhaps completely in the direction of the velocity vector?
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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?
answer/question/discussion: ->->->->->->->->->->->-> :
The perpendicular of the line of motion would be greater in magnitude?
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You'll want to think through this enough to justify your answer. Hopefully my inserted notes will help.
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*#&!
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I think you have a good picture, according to your description.
You might not be conceptualizing everything correctly, but I believe my notes will help.
&#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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