The experiment setup is as follows:

1) What are the precautions of the experiment(measuring Young's modulus of copper)?
2)As a parameter of mechanical property, why is Young’s modulus (defined by stress/strain) more useful than force constant (defined by force/extension) for material selection?
Thanks a lot!

(1) Force might not remain constant from the G-clamp.

(2) Young's modulus is more useful than the force constant, since the force constant is only constant within an ideal spring.

__________________
"Dissent is the highest form of patriotism." - Thomas Jefferson.

"Give me control of a nation's money and I care not who makes her laws." -Mayer Amschel Rothschild

I study Mathematical Physics at the
University of Waterloo.

-DC

I can't quite understand your two sentences. Can you further explain??

(1) You might not get a constant resistive force from the G-clamp because friction itself isn't always constant.

(2) If the string that connects the load to the wooden blocks is not an ideal spring, then the strain is a more reliable measurement.

__________________
"Dissent is the highest form of patriotism." - Thomas Jefferson.

"Give me control of a nation's money and I care not who makes her laws." -Mayer Amschel Rothschild

I study Mathematical Physics at the
University of Waterloo.

-DC

Still a bit confused for (2)

This question actually is not for the experiment, but for the general case(material selection).

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Setting this equal to Hooke's Law;

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Since x = delta L,

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So k is actually dependant on young's modulus.

__________________
"Dissent is the highest form of patriotism." - Thomas Jefferson.

"Give me control of a nation's money and I care not who makes her laws." -Mayer Amschel Rothschild

I study Mathematical Physics at the
University of Waterloo.

-DC