Suppose an object is hanging from the end of a spring. Let the spring's length when the object is hanging at rest be l. Now suppose we pull the object, causing the spring to stretch to a new length of l'. What can we conclude about the relationship between the force applied to the spring and the change in length?
1) The force applied to the spring is directly proportional to the change in length
2) The force applied to the spring is inversely proportional to the change in length
3) The force applied to the spring is unrelated to the change in length
4) Cannot be determined without additional information