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ramyani chakrabarty (3105)

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total posts: 2537
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In solving this type of problem, there is a four step method.

Step no1 Identify the system ( body on which the equn F=ma is to be applied)

Step no2 List all the forces acting on the system.

Step no3 Draw a free body diagram ( a diagram in which we consider the body under consideration as a point and show all forces by lines in proper direction)

Step no4 Finally appply the equn F=ma

Now in the given problem let us first take Man as a system.
What r the forces acting on man ?
           1.The normal force N due to the chair on the man.
            2.The weight of the man mg.
             3. The force T that the rope exerts on him.
             Then, T + N - mg = ma -----------(1)

Now let us take chair as system.

What r the forces acting on the chair ?

    1. The force T exerted by the rope on the chair
       2. The normal force N exerted by the man on the chair
        3. The weight of the chair Mg.
The equn is
                T - N - Mg = Ma ------(2)
Solving and substituting the values we get a = 2 m / s²

NIT silchar electrical engineering

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