Or they can bounce off each other instead and have the same speed after their interaction. Two new concepts are useful in studying the different interactions just described-work and energy. In this unit, you will begin the process of understanding scientific definitions of work and energy. You will start by considering both intuitive and mathematical definitions of the work done on objects by forces. You will also learn how to calculate the work in the non-constant forces needed to stretch a spring through a known distance.
Energy is one of the most powerful and challenging concepts in science.
You will begin the study of energy by working with kinetic energy, a type of energy related the motion of objects with mass. By considering the kinetic energy change of an object and the net work done on it in idealized situations, you can explore the relationship between these two quantities. This unit will end with an interesting application of the concepts of work, energy, and momentum conservation to the martial art of Karate. You will combine theory and your own observations to predict whether on not you can break a pine board with your bare hand. The Japanese style of Karate currently popular in the United States was developed in the 17th century on the island of Okinawa.