Conservation Physics online classes

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conservative and non conservative force:-
conservative forces:-
1) A force is said to be conservative if work done by force does not depend on the path followed by the particle.
2) it depends only on initial and final position of the particle.
3) work done by conservative force along a closed path is equal to zero.
4) Potential energy is only defined for conservative forces ( why, think )
5) some example of conservative forces are gravitational force, electrostatic force, spring force, magnetic force acting between the poles of the magnets.

Non conservative forces:-
1) A force is said to be non conservative if work done by the force depends on the path followed by the particle .
2) work done by non conservative force along a closed path is not equal to zero.
3) work done by non conservative force does not depend on the initial and final position of the particle.
4) Potential energy can not be defined for non conservative forces.
5) some examples of non conservative are friction , air resistance .
6) all the velocity dependent forces are the examples of the non conservative forces.

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Pseudo force:
1) it is a imaginary force which is considered while applying newton"s second law with respect to non inertial frame of reference 2) value of pseudo force is equal to product of mass of the body ( on which F=ma is to applied) and acceleration of the non inertial frame of reference( with respect to which F=ma is being applied)
3) direction of pseudo force is always opposite to the acceleration of the non inertial frame of reference with respect to which F=ma is being applied..
4) Pseudo force always acts at the centre of mass of the body on which F= ma is being applied

there are two types of frame of reference
1) inertial frame of reference:- A frame of reference is said to inertial frame of reference if its moving with constant velocity( zero acceleration) or it is at rest

2)non-inertial frame of reference:-A frame of reference is said to be non inertial frame of reference if it is moving with some acceleration.

important points regarding friction
1) when the net force along the contact surface( excluding friction) acting on the body is more than limiting friction value then there will be relative motion between the contact surface and type of friction acting between the contact surfaces would be kinetic.

2) when the net force along the contact surface( excluding friction) acting on the body is less than limiting friction value then there will not be relative motion between the contact surface and type of friction acting between the contact surfaces would be static.

kinetic friction:-
1)friction acting between the contact surfaces when there is relative motion between the same is called kinetic friction.
2) magnitude of kinetic friction between two surfaces is directly propostional to the normal reaction acting between the same contact surfaces.
3) direction of kinetic friction acting on a contact surface A due to contact surface B would be opposite to the velocity of contact surface A with respect to the contact surface B. and vice versa is true as well .