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PHY 231
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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Copy the problem below into a text editor or word processor.
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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: ->->->->->->->->->->->-> :
I understand the direction of the object and the net force. But I do not see their magnitudes. Is the magnitude of the object simply 9.8 m/s^2, thus making that its x-component. If not, I am still thinking that the force would be in the direction of half of the degrees between the object and the net force, which would be 195 degrees, which I drew with no exact x and y components. However, I do know that the x-component, although negative, has a greater magnitude than the y-component, as the cosine of 15 ( 195 -180 ) degrees in quadrant three is greater than the sine of 15 degrees ( 195 - 180 ).
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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? Is this component in the direction of motion or opposite to the direction of motion?
answer/question/discussion: ->->->->->->->->->->->-> :
I perceive the component of the force to be forward, in the direction of motion.
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• Will the object speed up, slow down or maintain a constant speed?
answer/question/discussion: ->->->->->->->->->->->-> :
The object will speed up, as the x and y-components increase.
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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: ->->->->->->->->->->->-> :
The component of force is directed to my left, along the negative y-axis, as observed from the regular orientation of the x and y-axes.
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• Will the object veer to the right, to the left or maintain straight-line motion?
answer/question/discussion: ->->->->->->->->->->->-> :
The object will veer to the right, as the component of force is along the y-axis and the object at 120 degrees from the positive axis is moving at a thirty degree angle between the positive y-axis and the second quadrant.
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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 component of the force along the line of motion is greater in magnitude than the component perpendicular to the line of motion.
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Copy and paste your work into the box below and submit as indicated:
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30 Minutes
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Is there a resource you can suggest to me on your website/ in the book for better understanding this??? I am still slightly confused about theses directions of motion, concerning their components and magnitudes, when trying to relate them on a coordinate grid setting.
Once you're oriented to these directions it's fairly straightforward. The link below should help.
&#See any notes I might have inserted into your document. If there are no notes, this does not mean that your solution is completely correct.
Then please compare your solutions with the expanded discussion at the link
Solution
Self-critique your solutions, if this is necessary, according to the usual criteria. Insert any revisions, questions, etc. into a copy of this posted document. Mark any insertions with &&&& so they can be easily identified.If your solution is completely consistent with the given solution, you need do nothing further with this problem. &#
&#No revision is necessary unless you have a question, or something you want me to review. &#