Module 6: Work and Energy

Module 6: Work and Energy

Introduction to Work and Energy

Perhaps the concept most central to all of physics is energy.   In many definitions of physics it is referred to as the science of matter and energy, but while we can easily grasp the idea of matter, energy is a little trickier to visualize. The four lessons in this module introduce us to different types of energy, with an emphasis on potential and kinetic energy, and to the overriding law of physics: the conservation of energy.  

Learning Objectives

Upon completion of this module, students will be able to: 

  • Define work
  • Calculate work
  • Calculate work done even when the force and the motion are not in the same direction
  • Define energy, including kinetic energy and gravitational potential energy
  • Differentiate between kinetic energy and gravitational potential energy
  • Explain conservation of energy
  • Be able to identify examples where conservation of energy can be used to simplify solutions
  • Solve problems using the law of conservation of energy
  • Define power
  • Calculate the power generated by a system

To Do List

1. Watch Video Lectures (links below)
2. Complete Practice Problems (links below)
3. Take the Module 6 Quiz
4. Complete the Exam Practice Problems for Module 6
5. Complete the Practice Exams 1

Lessons 

Lesson 6.1 Work

Here we define the work done by a force. Particular note should be taken when the force is not in the same direction as the displacement. This leads to a series of quantitative examples.

Lesson 6.2 Kinetic and Potential Energy

In this lesson we define energy and show how a body is given energy by doing work on it. By use of the gravitational force, we show that kinetic energy is equal to 0.5mv2. The concept of potential energy is also introduced with particular reference to gravitational potential energy.

Lesson 6.3 Energy Conservation 

Conservation of energy is a very important method for solving physics problems which would otherwise be very difficult or impossible. A series of different demonstrations and examples are presented which show the use of this technique.

Lesson 6.4 Power

We present the definition of power and give examples of how to calculate the power expended by a force.

Quiz

Once you have watched the lectures and completed the practice problems, you should demonstrate your understanding by taking the Module 6 Quiz. Be sure to submit the quiz before its deadline.

Coming Up

Exam 1 is coming up next! The exam will cover Modules 1 though 6. To prepare, you should complete the Exam 1 Review.