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PF1.5: WORK, ENERGY AND POWER. Energy exists in many different forms, eg, kinetic energy Ek, potential energy Ug, electrical energy, and elastic (or spring) energy Es. A fundamental principle of nature is that energy cannot be created or destroyed, only transformed or transferred.
Chapter 6: Work, Energy and Power Tuesday February 10th Reading: up to page 88 in the text book (Ch. 6) •Finish Newton’s laws and circular motion •Energy • Work (definition) • Examples of work •Work and Kinetic Energy •Conservative and non-conservative forces •Work and Potential Energy •Conservation of Energy
The terms ‘work’, ‘energy’ and ‘power’ are frequently used in everyday language. A farmer ploughing the field, a construction worker carrying bricks, a student studying for a competitive examination, an artist painting a beautiful landscape, all are said to be working. In physics, however,
Energy is defined as the capacity to do work and comes in different forms: Gravitational potential energy - this is dependent on the object’s position in a gravitational field and its mass. It increases as an object’s height above the ground increases.
7.8.Work, Energy, and Power in Humans • Explain the human body’s consumption of energy when at rest vs. when engaged in activities that do useful work. • Calculate the conversion of chemical energy in food into useful work.
Teacher Toolkit - The Basics of Work, Energy, and Power. Objectives: To describe the conditions under which positive and negative work are done and to use the work equation to calculate the amount of work done.
To understand energy and conservation of energy, we must first define some terms: work, kinetic energy (KE), and potential energy (PE). We’ll get to PE in the next Chapter.
