Elastic Potential Energy

The graph shows the stretching of two different springs, A and B, when different forces were applied. Which spring is stiffer?

What feature of the F vs. x graph informs you on the spring stiffness?

Determine the spring constant for Spring A.

Determine the spring constant for Spring B.

A spring is attached to the floor and is pulled straight up by a string. The string's tension is measured. The graph shows the tension in the string as a function of the spring's length. Does this obey Hooke's Law.

What is the spring constant for this spring?

The left end of a spring is attached to a wall. When Babs pulls on the right end with a 200 N force, she stretches the spring by 20 cm. The same spring is then used for a tub-of-war between Babs and Casey. Each pulls on their end of the spring with a 200 N force. How far does Bab's end of the spring move?

A mass hung from a spring stretches the spring by 4.0 cm. If the same mass is hung from a second spring having half the spring constant as the first, by how much will the second spring stretch?

You pull on a spring which obeys Hooke's Law, in two steps. In step 1 you extend it by distance x_s. In step 2, you further extend it by the same distance, x_s. Choose the answer that correctly compares the elastic potential energy of the spring after the first step (U_s1) with that after the second step (U_s2).