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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
For this work, he shared the 1965 Nobel Prize with Julian...
- 11.1 Temperature and Thermal Energy
9.1 Work, Power, and the Work–Energy Theorem; 9.2 Mechanical...
- 22.1 The Structure of The Atom
In addition, the High School Physics Laboratory Manual...
- 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...
- 15.1 The Electromagnetic Spectrum
Work, Energy and Power are fundamental concepts of Physics. Work is said to be done when a force (push or pull) applied to an object causes a displacement of the object. We define the capacity to do the work as energy. Power is the work done per unit of time.
Follow along with common work and power example problems and solutions. See how to solve problems when force is applied directly parallel or at an angle.
Work, Energy, and Power. Lesson 1 - Basic Terminology and Concepts; Definition and Mathematics of Work; Calculating the Amount of Work Done by Forces; Potential Energy; Kinetic Energy; Mechanical Energy; Power; Lesson 2 - The Work-Energy Relationship; Internal vs. External Forces; Analysis of Situations Involving External Forces
Examples of Power. Examples of power are limited only by the imagination, because there are as many types as there are forms of work and energy. (See Table for some examples.) Sunlight reaching Earth’s surface carries a maximum power of about 1.3 kilowatts per square meter \(kW/m^2\) A tiny fraction of this is retained by Earth over the long ...
All machines are typically described by a power rating. The power rating indicates the rate at which that machine can do work upon other objects. Thus, the power of a machine is the work/time ratio for that particular machine. A car engine is an example of a machine that is given a power rating.
Examples of energy transfers include: A swinging pirate ship ride at a theme park. Kinetic energy is transferred into gravitational potential energy. A boat being accelerated by the force...
