The block shown moves with constant velocity on a horizontal surface.Two of the forces on it are shown.A frictional force exerted by the surface is the only other horizontal force on the block.The frictional force is: 
Definitions:
Alzheimer's Disease
A progressive neurodegenerative disease that destroys memory and other important mental functions by affecting brain cells.
Vascular Dementia
A decline in cognitive function resulting from conditions that block or reduce blood flow to the brain, depriving brain cells of oxygen and nutrients.
Elderly Population
Refers to individuals typically aged 65 years and older, a demographic group often characterized by unique health, social, and psychological needs.
Nursing Homes
Facilities that provide residential care for elderly or disabled people, offering medical and daily living assistance.
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