Concept #1: Review: Intro to Springs
Practice: A vertical spring is originally 60 cm long. When you attach a 5 kg object to it, the spring stretches to 70 cm. (a) Find the force constant on the spring. (b) You now attach an additional 10 kg to the spring. Find its new length.
Concept #2: Work by Variable Forces & Springs
Example #1: Work by Variable Forces
Example #2: Work by Variable Forces
Practice: It takes 200 J of energy to compress a 1.0 m-long spring to 70 cm. How much work would it take to compress this same spring from 70 cm to 50 cm?