1.The springs used in ball-point pens are some of the weaker examples found in p

Question

1.The springs used in ball-point pens are some of the weaker examples found in practical applications. It usually only takes about 5 gram of mass resting on such a spring to compress it by 1 millimeter. Which of the following most closely describes the force constant of a typical ball-point pen spring?

2.On the other hand, the coil springs used to support the weight of car bodies are much stiffer. Typically it takes about 300 pounds to compress such springs by 1 inch. Which of the following most closely describes the force constant of a coil spring for a car?

Explanation / Answer

1)

m g = k x

k = mg/x = 5e-3*10/1e-3 = 50 N/m

2)

m g = k x

k = mg/x = 300*0.453592*10/(1*0.0254) = 53574 50,000 N/m

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