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phy121
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: ->->->->->->->->->->->-> :
assuming the 6kg side is positive direction, f=m*a =6*9.8=58.8 newtons
assuming the 5kg side is negative direction f=m*a = 5*-9.8 = -49 newtons
netforce=58.8+-49=9.8 newtons
fnet=m*a
9.8=11*a
A= .89 m/sec^2
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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: ->->->->->->->->->->->-> :
here acceleration is still .89m/sec^2 and v0=-1.8m/sec since it is descending, `dt=1sec
vf=v0+a*`dt
= -1.8+.89*1
Vf = -.91 m/sec (descending)
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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 1st second, the velocity and acceleration of the system is moving in opposite directions. The 5kg mass is slowing down and the 6kg mass is speeding up.
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15 minutes
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&#Very good responses. Let me know if you have questions. &#