Work, Power, Energy
Work
Work done by the force is measured by the product of magnitude of force and the displacement of the point of application in the direction of force.
i.e., W=F.S
Work done = component of force in the direction of the displacement \[\times \] magnitude of displacement.
i.e., W= (F cos q) S=F S cos q or W=\[\overrightarrow{F.}\,\overrightarrow{S}\]
In terms of rectangular components, work done
W=\[\overrightarrow{F.}\,\overrightarrow{d}\]
\[W=(\hat{i}\,{{F}_{x}}+\hat{j}\,{{F}_{y}}+\hat{k}\,{{F}_{Z}}).(\hat{i}\,\,dx+\hat{j}\,dy+\hat{k}\,\,dz)\]
\[={{F}_{x}}dx+{{F}_{y}}dy+{{F}_{Z}}dz\]
Units of work
SI unit: joule (J). One joule of work is said to be done when a force of one newton displaces a body by one metre in the direction of force
\[1\,\,joule={{10}^{7}}erg\]
Dimensions of work:
Work = force, displacement
\[=[ML{{T}^{-2}}][L]=[M{{L}^{2}}{{T}^{-2}}]\]
Work Done in Pulling and Pushing an Object
\[F=\frac{\mu \,\,Mg}{\cos \theta +\mu \sin \theta }=force\,\,required\,to\,pull\,on\,object\] force required to pull an object \[W=F\,\,d=\frac{\mu \,\,Mg\,\,d}{\cos \theta +\mu
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In the atom, there are three sub-atomic particles — Protons, Neutrons and Electrons. Protons and Neutrons are located right in the nucleus (centre or core) of the atom. Around the nucleus, here are electrons that are constantly moving very quickly. The electrons move because they have some energy. Neutrons have no charges. Protons are positively charged. Electrons are negatively charged, and they encircle the nucleus. Elections encircle the nucleus because opposite charges (negative charge electrons and positive charge protons) are attracted to each
The beam is simply a long plank. It may be wood, metal or any durable material. The beam rests on a fulcrum (a point on the bar creating a pivot).
When we push down one end of a lever, we apply a force (input) to it.
