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define net force
the sum of all forces acting on a body
what is true if net force is 0
no forces are presents or forces are balanced
what are the 2 vertical forces
weight and reaction
what are the 2 horizontal forces
friction and air resistance
what are the factors that can increase friction
roughness of ground surface
roughness of contact surface
increased temp of ground
increasing size of the normal reaction force
what are the factors that can decrease air resistance
decreasing velocity
improving streamlineability
decreasing frontal cross section
increasing smoothness of the surface
when does the friction arrow point backwards
on ice and snow