If the external forces acting on a syste...

If the external forces acting on a system have zero resultant, the centre of mass

must not move

must not accelerate

must move

may accelerate

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Statement-1: If the resultant of all the forces acting on a system is zero then the torque on the system about any point is same. Statement-2: If the resultant of the forces acting on a system is zero then acceleration of its centre of mass is zero.

According to the principle of conservation of linear momentum if the external force acting on the system is zero, the linear momentum of the system will remain conserved. It means if the centre of mass of a system is initially at rest, it will remain at rest in the absence of external force, that is, the displacement of centre of mass will be zero. A plank of mass M is placed on a smooth horizontal surface. light identical springs, each of stiffness K , are rigidly connected to struts at the end of the plank as shown in Fig. When the springs are in their unextended position, the distance between their free ends is 3l . A block of mass m is placed on the plank and pressed against one of the springs so that it is compressed to l . To keep the block at rest it is connected to the strut means of a light string. Initially, the system is at rest, Now the string is burnt. The maximum displacement of the plank is

NTA MOCK TESTS-NTA NEET SET 46-PHYSICS

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