2) Which combination of statements is most accurate? [Enter your answer as a str

Question

2) Which combination of statements is most accurate? [Enter your answer as a string of the letter options you believe are correct. For instance, if you think options A, D, and E are correct, then enter "ADE"]

A) If net force is zero then an object's momentum is constant. B) Net force equals the sum of the magnitudes of all the forces on an object. C) If an object is in translational equilibrium, then the net force on the object is a non-zero constant. D) Every force on an object is balanced by another equal magnitude, oppositely directed force on that object. E) None of the above

Explanation / Answer

I will justify each option one by one.

option B is incorrect as net force is equal to the vector sum of all acting forces.

option C is incorrect because for translational equilibrium, the net force should be zero.

option D not necessary, because if there are two forces acting on a body then they will balance only when both are equal in magnitude but oposite in direction. but if there are three forces then there vector sum will be zero if they balance each other and in that condition it is not necessary that all three having equal magnitude and direction in opposition.

option A yes, if net force is zero then surely sum of external force acting on system will also zero, so object's momentum will constant.

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