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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: ->->->->->->->->->->->-> :
Fnet= = 6 * 9.8 - 5 * 9.8
Fnet = 58.8 - 49
Fnet = 9.8 N
Fnet = a * m
a = Fnet / m
a = 9.8 N / 11 kg = 0.89 m/s^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: ->->->->->->->->->->->-> :
v0 = -1.8 m/s
a = 0.89 m/s^2
'dv = 0.89 * 1 = 0.89 m/s
0.89 = vf - (-1.8)
vf = -0.91 m/s
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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: ->->->->->->->->->->->-> :
The velocity and acceleration are in opposite directions. The system is slowing down.
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&#Very good work. Let me know if you have questions. &#