Chapter 5

# Chapter 5 - Chapter 5 Equilibrium An object on which the...

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Chapter 5 Equilibrium An object on which the net force is zero is said to be in equilibrium . The object might be at rest in static equilibrium Or might be moving in a straight line with constant velocity in dynamic equilibrium . Both of these conditions are identical from a Newtonian perspective because F net = 0 and a = 0 . Where in F i I stands for the individual forces. Mass and weight Mass and weight are related but not equal. Mass is the amount of matter in an object while weight is the force of the earth pulling down on the object. The only force acting on it is its weight, the downward pull of gravity, so F net = w . From Newton’s 2 nd Law, F net = w = ma a free-fall = (9.80 m/s 2 , downward) = ( g , downward) ( ) ( ) 0 ( ) ( ) 0 ( ) ( ) 0 net x i x i net y i y i net z i z i F F F F F F = = = = = =

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Therefore, w = ( mg , downward). The magnitude of the weight force is directly proportional to the mass m , where g is the constant of proportionality, so that
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Chapter 5 - Chapter 5 Equilibrium An object on which the...

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