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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
15.1 The Electromagnetic Spectrum - 9.1 Work, Power, and the...
- 22.4 Nuclear Fission and Fusion
22.4 Nuclear Fission and Fusion - 9.1 Work, Power, and the...
- 23.1 The Four Fundamental Forces
The more energy input or ΔE, the more matter m can be...
- 11.1 Temperature and Thermal Energy
11.1 Temperature and Thermal Energy - 9.1 Work, Power, and...
- 22.1 The Structure of The Atom
22.1 The Structure of The Atom - 9.1 Work, Power, and the...
- 23.3 The Unification of Forces
As discussed earlier, the short ranges and large masses of...
- 21.3 The Dual Nature of Light
21.3 The Dual Nature of Light - 9.1 Work, Power, and the...
- 15.1 The Electromagnetic Spectrum
Explain work as a transfer of energy and net work as the work done by the net force. Explain and apply 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.
Use the work-energy theorem to find information about the forces acting on a particle, given information about its motion. We have discussed how to find the work done on a particle by the forces that act on it, but how is that work manifested in the motion of the particle?
Concepts of work, kinetic energy and potential energy are discussed; these concepts are combined with the work-energy theorem to provide a convenient means of analyzing an object or system of objects moving between an initial and final state.
We will find that some types of work leave the energy of a system constant, for example, whereas others change the system in some way, such as making it move. We will also develop definitions of important forms of energy, such as the energy of motion. Net Work and the Work-Energy Theorem
Because the concepts of kinetic energy, and energy in general, are so important, various names have been given to the important terms in equations such as these. $\tfrac{1}{2}mv^2$ is, as we know, called kinetic energy. $\FLPF\cdot\FLPv$ is called power: the force acting on an object times the velocity of the object (vector “dot” product ...
