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An object with a mass of #4 kg# is hanging from a spring with a constant of #2 (kg)/s^2#. If the spring is stretched by # 8 m#, what is the net force on the object?

Answer 1

Olivia Askew

#SigmaF=23.2N# downwards

Two forces are known to be at work: one stemming from the mass and the other from pulling the spring.

#F_1=mg=4*9.81=39.24N# (the force pulling on the object)

#F_2=kDeltax=2*8=16N# (the force the the object exerts on the spring and vice versa)

We know that #F_1# acts downwards, and #F_2# acts upwards.

#SigmaF=F_1-F_2=39.24-16=23.24~~23.2N# downwards

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Answer 2

Julia Aguilar

The net force on the object is 16 N.

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.