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Have you ever wondered what force a spring inside a pen has in terms of Hooks's Law? 

Today, Mr Jegorovas asked all of us to describe Hooke's Law and the weight dependent on the spring's extension or compression. 

Hooke's Law: F = K x e

*F is the force in newtons, n

*k is the 'spring constant' in newtons per metre, N/m

*e is the extension in metres, m

The Image above shows a pen with a spring. The spring will push the ball point with the same force applied as to the plunger of the pen to the spring. The spring will compress due to the force applied to the plunger. Hooke's Law works as long as the spring's limit not exceeded. This is sometimes known as the proportionality. 
The force applied to the spring will exert the ball point out. The graph of force extension shows a straight line (or a best fit if estimated) on the image. The gradient of the line is the spring's constant, K. The stiffer the spring the more constant the spring should be.

More: Hooke's Law defined in detail     (hooke's law)