A rod rests on frictionless ice.Forces that are equal in magnitude and opposite in direction are simultaneously applied to its ends as shown.The quantity that has a magnitude of zero is its: 
Definitions:
Ecological Systems Theory
A theory proposed by Urie Bronfenbrenner, suggesting that human development is influenced by different kinds of environmental systems ranging from the immediate family and school settings to broader community and society levels.
Microsystem
Microsystem refers to the closest layer of the social environments in an individual's life, such as family and school, and the interactions within these settings.
Intrapychic Conflict
An internal struggle arising from opposing demands or impulses within an individual's mind.
Prosocial Behaviors
Voluntary actions that are intended to help or benefit another person or group of people without expecting anything in return.
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