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7 Terms

1
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define net force

the sum of all forces acting on a body

2
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what is true if net force is 0

no forces are presents or forces are balanced

3
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what are the 2 vertical forces

weight and reaction

4
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what are the 2 horizontal forces

friction and air resistance

5
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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

6
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what are the factors that can decrease air resistance

decreasing velocity

improving streamlineability

decreasing frontal cross section

increasing smoothness of the surface

7
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when does the friction arrow point backwards

on ice and snow