A 2.0-kg block slides on a rough horizontal surface.A force (P = 6.0 N) is applied to the block as shown.The magnitude of the block's acceleration is 1.2 m/s2.What is the magnitude of the force of friction acting on the block? 
Definitions:
Heritability Coefficients
A statistic used in genetics to estimate the proportion of variation in a phenotype that can be attributed to genetic differences among individuals in a population.
Twin Studies
Research studies that compare the similarities and differences between monozygotic (identical) and dizygotic (fraternal) twins to understand how genetics and environment influence traits and behaviors.
Non-twin Studies
Non-twin studies are research designs that investigate the effects of environmental and genetic factors on individuals without relying on comparisons between twins, contrasting twin study methodologies.
Evolutionary Psychologist
A professional who studies how evolutionary theory explains psychological traits and behaviors as adaptations.
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