why is it necessary to separate contact force into a normal force and frictional force? Give at least two reasons
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NORMAL is a vector direction at right angles to the surface of the two items in contact
the force to move is Parallel to the surface.
friction is the force due to microscopic roughness and atomic electronic forces between the surfaces. the Friction force is opposite to the parallel force causing motion. Ice has liquid at the surface so the friction is low
sliding of solids on solids has high friction.
DIRECTION OF FORCE IS VERY VERY VERY IMPORTANT!
the force to move is Parallel to the surface.
friction is the force due to microscopic roughness and atomic electronic forces between the surfaces. the Friction force is opposite to the parallel force causing motion. Ice has liquid at the surface so the friction is low
sliding of solids on solids has high friction.
DIRECTION OF FORCE IS VERY VERY VERY IMPORTANT!
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