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Phy 121
Your 'cq_1_12.1' report has been received. Scroll down through the document to see any comments I might have inserted, and my final comment at the end.
** CQ_1_12.1_labelMessages **
Masses of 5 kg and 6 kg are suspended from opposite sides of a light frictionless pulley and are released.
• What will be the net force on the 2-mass system and what will be the magnitude and direction of its acceleration?
answer/question/discussion: ->->->->->->->->->->->-> :
Choosing the 6kg side down direction as positive.
F_5kg=5kg*-9.8m/s^2=-49N
F_6kg=6kg*9.8m/s^2=58.8N
F_net=58.8N-49N=9.8N
a=F/m=9.8N/11kg=.89m/s^2
The accel is positive and the 6kg side is moving down.
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• If you give the system a push so that at the instant of release the 5 kg object is descending at 1.8 meters / second, what will be the speed and direction of motion of the 5 kg mass 1 second later?
answer/question/discussion: ->->->->->->->->->->->-> :
for the 5kg weight accel will = -.89m/s^2, v0=1.8m/s, ‘dt=1s
vf=v0 + a ‘dt=1.8m/s + -.89m/s^2*1s=.91m/s
1 second later speed is .91m/s and the 5kg mass is moving down.
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• During the first second, are the velocity and acceleration of the system in the same direction or in opposite directions, and does the system slow down or speed up?
answer/question/discussion: ->->->->->->->->->->->-> :
During the first second the velocity of the system is opposed to the acceleration of the system. They are in opposite directions.
The system is slowing down.
&#Very good responses. Let me know if you have questions. &#