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Physics

Key Equations

PhysicsKey Equations

4.2 Newton's First Law of Motion: Inertia

Newton's first law of motion F net = 0 F net = 0 or ΣF=0 ΣF=0

4.3 Newton's Second Law of Motion

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

4.4 Newton's Third Law of Motion

normal force for a nonaccelerating horizontal surface N=mg N=mg
tension for an object at rest T=mg T=mg
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