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PHY 201
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: ->->->->->->->->->->->-> :
6 kg * 9.8 m/s^2 = 59 N
5 kg * 9.8 m/s^2 = 49 N
Two forces thus act on the system, the 59 N force in the positive direction and the 49 N force in the opposite direction, giving us a net force of F_net = 59 N - 49 N = 10 N
a = F_net / m = 10 N / (11 kg) = .9 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: ->->->->->->->->->->->-> :
`dv = a `dt = .9 m/s^2 * 1 s = .9 m/s
vf = v0 + `dv = -1.8 m/s + .9 m/s = -.9 m/s
The 5 kg object will still be descending, but at .9 m/s rather than at 1.8 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 acceleration is positive and the velocity remains negative
velocity and acceleration are in opposite directions
The object is slowing down
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&#Good responses. Let me know if you have questions. &#