Unit 8

On Friday we learned about work and energy. Work is a scalar quantity and is any change in energy. The equation for work is W=F x d or N x m which equals a Joule (J). You need to change position or have distance in order to do work. Energy is the ability to do work, and by the law of conservation of energy, energy cannot be created or destroyed it can only change forms. We also learned about some of the different types of energy such as, Gravitational Potential Energy or the energy an object has due to its position in a gravitational field, Kinetic Energy or the energy of motion, and Spring Potential Energy.

This is a picture of Stonehenge in England. What makes Stonehenge so interesting is that nobody knows how the stones came to be in their current location. The closest place with stones of this size is 30km (18mi) to the North East. These stones traveled a distance with kinetic energy. If the stones were lifted during transport they would have had gravitational potential energy represented by the equation m x g x h.