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Key Equations
Newton's first law of motion F net = 0  F net = 0  or  ΣF=0  ΣF=0
Newton’s second law of motion   F net =ma    F net =ma  or  ΣF=ma  ΣF=ma
Newton’s second law of motion to solve acceleration  a= F net m   or  a= ΣF m  a= F net m   or  a= ΣF m
Newton’s second law of motion to solve weight  W=mg  W=mg
normal force for a nonaccelerating horizontal surface  N=mg  N=mg
tension for an object at rest  T=mg  T=mg