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Phy 241
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.
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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: ->->->->->->->->->->->-> :
f1=ma=5kg*9.8m/s^2=49N ; f2=6kg*9.8m/s^2=58.8N ; fNet=58.8N-49N=9.8N
a=fNet/m=9.8N/11kg=0.89m/s^s and it will be in the direction of the 6kg mass.
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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: ->->->->->->->->->->->-> :
v0=-1.8m/s ; `dt=1s ; a=0.89m/s^2
vf=a`dt+v0=.89m/s^2*1s-1.8m/s=-0.91m/s this will be in the direction of the 5kg weight.
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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: ->->->->->->->->->->->-> :
In the first scenario where the system is just released, acceleration and vel will be in the same direction and vel will be speeding up. In the second scenario where a push is given to the 5kg side, the acceleration will be in the opposite direction of the initial vel and it will be slowing down.
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&#Very good responses. Let me know if you have questions. &#