Which of the following statements A- D is correct concerning forces on a system?

Question

Which of the following statements A- D is correct concerning forces on a system? a. Forces that one part of a system exert on another part of that system can change the motion of the system. b.Newton's 2nd law applies to individual particles but not to systems of particles. C. The motion of the center of mass of two particles changes when the particles collide. d.A system moves as if all its mass is concentrated at its center of mass and all external forces are applied at that point. e.None of the statements A - D are correct

Explanation / Answer

a ) incorrect- Forces that on e part of a system exert on another part of that system cannot change the motion of the system. This may be internal force of the system and internal force does change the motion of the system.

b) Incorrect - Newton's second law can be applied for individual particles as well as system of particle.

c) Incorrect - motion of system of particles does not change before and after the collision.becuase there is no any external forces act on the system and only external force changes the motion of system of particles.

d) Correct - A system moves as if all its mass is concentrrated at its center of mass and all external forces are applied at that point.

e) incorrect statement.

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