tension force questions

Mar 2009
Can someone help me with these questions. Thanks a lot!!

A person hangs a 50 grams mass hanger from a force probe. Later, he connect a string between the mass and force probe.

Question 1. What is the effect on the force by the string? My answer: I think that there is no effect, but don't know how to explain.

Question 2. Under what conditions can we ignore the mass of a string when measuring tension forces?

Question 3. Would the force measured by the probe change if we replace the string with a 1 kg chain?
Dec 2008
Las Cruces NM
I think you should explain what a "force probe" is.
Is your class developing some kind of exotic technology?