Conservative and Non conservative forces


Conservative ForcesNon conservative Forces
Gravitation$(mg)$Friction$(\mu N)$
Elastic Forces $(kx)$Viscosity
Electric Forces $(\frac{kq}{r^{2}})$Air resistance
Motor or rocket propulsion
The tension in the cord $(T)$

Some Points about Conservative forces and Non-conservative forces

1) Potential energy is defined for Conservative forces

2) An object that starts at a given point and returns to the same point, then network done by the conservative force is zero while in case of non-conservative force, it will not be zero

3) When several conservative forces act on a particle, the potential energy is the sum of the potential energies for each force

4) Potential energy belongs to the system not to single particle as it is associated with Force and force on one object is always exerted by other particles

5) If only conservative forces are acting, the mechanical energy(KE+PE) of the system remains constant

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