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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?
5kg*9.8m/s^2 = 49N, 6kg*9.8m/s^2 = 58.8N, Fnet = 58.8N – 49N = 9.8N
a=9.8N/11kg = .89m/s^2 in the direction of the 6kg side.
• 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?
What is the initial speed of the system?
Does the system speed up or slow down? What is the magnitude of its acceleration?
The system can move in one of two directions, one in which the greater mass is descending, one in which the lesser mass is descending. You have to pick one of these directions as your positive direction. Do so. It doesn't matter which one you pick, but once you make the choice, you need to stick with it.
Relative to your chosen direction, is the given velocity positive or negative? Is the acceleration positive or negative?
What therefore are the initial velocity, acceleration and time interval?
You can reason out all the other quantities from these.
answer/question/discussion:
• 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:
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15 mins
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I need a push start on the 2nd and 3rd question
Good start.
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