phy121
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 in the direction of motion, as well as its component perpendicular to the direction of motion.
done
Suppose you are facing in the direction of motion. Do you perceive the component of the force in the direction of motion to be forward or backward? It this component in the direction of motion or opposite to the direction of motion?
Forward
Will the object speed up, slow down or maintain a constant speed?
slow down
If you are facing in the direction of motion, then the directions perpendicular to the direction of motion will be to your right and to your left. Is the component of the force perpendicular to the direction of motion to the right or to the left?
It will be to the right, but 120* is not perpendicular to 270*.
Will the veer to the right, to the left or maintain straight-line motion?
It will veer left.
Which is greater in magnitude, the component of the force along the line of motion or the component perpendicular to the
line of motion?
I'm afraid I don't understand the question. Since there is no quantites, I'm unsure how I'm supposed to quantify which is larger.
You are given the directions of the two vectors. Is the force vector directed more in a direction parallel to the direction of motion or perpendicular to the direction of motion?
The two vectors are at 270 deg - 120 deg = 150 degrees. So the force vector is only 30 deg from the direction parallel to the motion, which means it is 60 deg from the perpendicular direction. The component in the parallel direction is therefore greater than the component in the perpendicular direction.
The component in the direction of motion is obtained by project in the force vector onto the direction of motion, just as you would project any vector onto the direction of one of the coordinate axes. The component perpendicular to the direction of motion is obtained by project in the vector onto a direction perpendicular to that of the motion.