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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. Let’s look at work and KE. Definition of work done by a force: consider an object moving while a constant force F is applied to the object.
7.1. Work: The Scientific Definition. Explain how an object must be displaced for a force on it to do work. Explain how relative directions of force and displacement determine whether the work done is positive, negative, or zero. 7.2. Kinetic Energy and the Work-Energy Theorem.
Equations Associated with Newton’s Laws Impulse: 𝑰⃗=∆𝒑⃗⃗=𝑭⃗⃗ 𝒂𝒗𝒈 ∙∆ ∑ ⃗= 𝑎⃗, w= , Rotational Motion and Torque
The work-energy principle states that the net work done on an object changes its kinetic energy. While work done by propulsive forces, such as driving force of an engine, increases kinetic energy, work done against
A body that has energy may transfer some, or all, of its energy to another body. The total amount of energy remains constant (conserved) even if it has been transformed to another type. The amount of energy transformed (∆E) is called work W. The body losing energy does work, the body gaining energy has work done on it.
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.
In this subsection we will introduce the concepts of work and energy on simple one- dimensional examples. These concepts arise naturally upon integration of Newton’s equa-
