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Review the units of work, energy, force, and distance. Use the equations for mechanical energy and work to show what is work and what is not. Make it clear why holding something off the ground or carrying something over a level surface is not work in the scientific sense.
- 15.1 The Electromagnetic Spectrum
Teacher Support [BL] Explain that the term spectrum refers...
- 22.4 Nuclear Fission and Fusion
As shown in Figure 22.26, a neutron strike can cause the...
- 23.1 The Four Fundamental Forces
9 Work, Energy, and Simple Machines. Introduction; 9.1 ......
- 11.1 Temperature and Thermal Energy
Heat is often confused with temperature. For example, we may...
- 22.1 The Structure of The Atom
9 Work, Energy, and Simple Machines. Introduction; 9.1 Work,...
- 23.3 The Unification of Forces
As discussed earlier, the short ranges and large masses of...
- 21.3 The Dual Nature of Light
Figure 21.10 shows a comet with two prominent tails. Comet...
- 7.1 Work
Evaluate the work done for various forces. In physics, work...
- 15.1 The Electromagnetic Spectrum
In physics, work represents a type of energy. Work is done when a force acts on something that undergoes a displacement from one position to another. Forces can vary as a function of position, and displacements can be along various paths between two points.
Evaluate the work done for various forces. In physics, work is done on an object when energy is transferred to the object. In other words, work is done when a force acts on something that undergoes a displacement from one position to another.
The Work-Energy Theorem. The principle of work and kinetic energy (also known as the work-energy theorem) states that the work done by the sum of all forces acting on a particle equals the change in the kinetic energy of the particle.
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.
work energy theorem. text. W = ∆E. work causes a change in energy; work shifts energy from one system to another; Sign conventions: When a system does work on its environment, W < 0; that is, the total energy of the system decreases. Work is done by the system.
Work-Energy Theorem. Draw a free-body diagram for each force on the object. Determine whether or not each force does work over the displacement in the diagram. Be sure to keep any positive or negative signs in the work done. Add up the total amount of work done by each force.
