Question

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Who dares to answer my question ???? -_^
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What is the :-
1.Law of conversation of linear momentum.
2.Law of conversation of Energy.
3.Law of conversation of Angular Momentum.

Answer 1

(1)Law of Conservation of linear Momentum---

✴the law of conservation of linear Momentum states that if no external force is act on the system of two Coliding objects,then the vector sum of linear Momentum of each body remains constant and is not affected by mutual interaction.
.it states that if external force acting on a system is 0 ,the total momentum of the system remains constant.

PROOF..

let us consider the particles of mass m and acceleration a .then from the 2nd law of motion.

F=dP/dT

if no external force act on the body then F=0

F=dP/dT=0

therefore P is constant.

✴Law of Conservation of energy--

This law states that the energy can neither be created nor destroyed only can change from one form to another..

Example..
like if we are going to start a electric bulb the the energy not formed or destroyed only that changes as..

Electrical Energy➡Heat Energy➡Light energy

✴Law of conservation of angular Momentum---

It states that if net external torque acting on a system is 0.the total momentum of the system about the axis remains constant.

dL/dT=torque ...

Answer 2

Hii....



1 LAW OF CONSERVATION OF ENERGY

It states that the total energy E of a system can change only by amounts of energy that r transferred to/from the system.
W=∆E=∆E(mech)+∆E(thermal)+∆E(internal)

Note:The total energy E means the sum of Mechanical energy and internal energy, incl thermal energy of a system.

In simple words, it means that energy cannot magically appear or disappear.



2 CONSERVATION OF LINEAR MOMENTUM
It states that if no net external force acts on a system of particles, the total linear momentum P of the system can't change.

Note(those who r following NCERT): In NCERT, we only focus on the external forces acting on a closed system...nd not internal forces acting within the system.
Internal forces acting in a body can't change the total linear momentum of the entire system.(They can bring changes to only some parts within the system).

To connect it with ur real life... I'll give u an eg..
There're plenty of forces acting within ur body... between all internal organs for it's functioning.
But nothing happens to the body from the exterior...U won't move from one place to another(ie by getting momentum) just bcz that ur heart exerts force for pumping blood..



3 LAW OF CONSERVATION OF ANGULAR MOMENTUM
It states that if the net external torque acting on a system is 0, the angular momentum (L) of the system remains constant, no matter what changes take place inside the system.

In simple words, the angular momentum L of a system remains constant if the net external torque acting on the system is 0(zero)..

I hope this helps u....
:)