Hooke's Law: Calculate Spring Constant k in Newtons or kg?

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In the discussion about Hooke's Law, the main query revolves around calculating the spring constant (k) and whether mass should be in Newtons or kilograms. It is clarified that mass should always be in kilograms, as Newtons is a unit of force, not mass. The formula k = mg/x can be redefined to k = F/x, allowing the use of force directly in Newtons. This distinction is important for accurate calculations in physics. Understanding these units helps avoid confusion in applying Hooke's Law effectively.
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Morning peoples,

I have a query about Hooke's Law. :confused: I have a problem which asks me to calculate the spring constant (k). I know how to do it, but my question is when I use the formula mg/x can mass be in Newtons or does it have to be in kg?

Looking forward to your answers. Thanks! :smile:
 
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Mass is never in Newtons. Newtons is a unit of force (remember F=ma?). That being said, if you want to redefine your equation by saying

k = (mg)/x = F/x

Then you can use your force directly.
 
Thanks for clarifying. Sometimes its hard to remember the simple stuff, you know? Thanks Fred. :smile:
 

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