^Weight, W
^Weight, W Weight of a mass (called victim mass, m) at a place is equal to gravitational pull experienced by it at that place due to the gravitational field of a source mass (M). It is given by
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^Atomic mass unit (u)
^Atomic mass unit (u)
^Contact force
^Contact force Force that is due to physical contact between the interacting bodies is called a contact force e.g. push, pull, friction, tension, up-thrust.
^Bohr correspondence principle
^Bohr correspondence principle According to this principle the quantum theory must give same result as classical theory in the appropriate classical limit.
^Field force
^Field force A force that interacts without a physical contact is called a field force e.g. gravitational, electromagnetic.
^Limitations of Bohr’s theory
^Limitations of Bohr’s theory It is valid only for single electron system. Nucleus was taken as stationary but it also rotates about its own axis. Couldn’t explain fine structure of spectral line. Provides no information about the relative intensities of spectral lines. Provides no distribution of electrons in an atom. Fails to explain that why […]
^Fundamental forces
^Fundamental forces Basic forces e.g. nuclear, electromagnetic, gravitational & weak.
^Free body diagram
^Free body diagram FBD is a vector diagram showing all the forces acting on a particular system.
^Tangential force
^Tangential force A force acting along or opposite to velocity is called tangential force. A force acting along velocity increases speed with time. A force acting opposite to velocity decreases speed with time. Tangential force can’t change direction. The work done by a tangential force is positive if it causes an increase in the KE […]
^External force
^External force Any force acting outside the system selected is called external force. Only external force can accelerate a system. Force internal or external is a matter of selection of system. e.g. if we consider a system of earth & sun, then the gravitational force on earth by sun & that by sun on earth […]
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