The friction force between two surfaces is modeled using the following equation: 
where 
friction force in N 
coefficient of friction 
normal force in N
What is the appropriate unit for 
if the preceding equation is to be homogeneous in units?
Definitions:
Seasonal Affective Disorder (SAD)
Disorder identified by a 2-year period in which a person experiences major depression during winter months and then recovers fully during the summer; some people with this disorder also experience mild mania during summer months.
Major Depressive Episodes
Periods characterized by severe depression symptoms such as deep sadness, loss of interest in activities, and other physical and cognitive impairments, significantly impacting one's daily life.
Psychosocial Events
Events that involve both psychological and social aspects, significantly impacting an individual's mental health and social functioning.
Cognitive Disorder
A class of psychological disorders that mainly influence abilities related to learning, memory, perception, and solving problems.
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