what is elastic and inelastic collision

Elastic collision 

         A collision in which kinetic energy of the system is conserved is called elastic collision.

In the ideal case when no kinetic energy is lost, the collision is said to be perfectly elastic.

Example

       when a hard ball is dropped onto a marble floor, it rebounds to very nearly the initial height. It loses negligible amount of energy in collision with the floor.

Inelastic collision

       A collision in which kinetic energy of the system is not conserved , is called the inelastic collision.
Example
      When tow tennis balls collide the then after collision , they rebound with velocities less than the velocities before, the inspect. During this process a portion of K.E is lost,partly due to friction as molecules in

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energy and there are to basic forms of kinetic and potential energy

Energy

     i read in my books word of  energy derive from energeia.  

     we defined as about energy  The ability of a body to do work is called energy.

     There are to basic forms of energy.

                                                                                 

 Kinetic and Potential energy                                                                              

What is kinetic energy 

    we also discus about energy and kinetic energy is other form of energy.kinetic word is derived from Greek word kinesis meaning motion.

      The possessed by a body due to its motion is called kinetic energy.
        it is given by the formula.

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what is work

work Definition 

       we can says work is the product of magnitude of  displacement and component of force in the direction of displacement. 

Explanation
      Let us consider an object which is being pulled by content  force F at angle theta to the direction of motion.The force F moves the object from position A to B through displacement D as shown in figure.

Now by definition work is given by.
                                   

W = (F cos 0) (d)

                                                                         = Fd  cos 0
where,
               F Cos 0 is component of force in the direction of displacement.

example of work

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Differance between Momentum and Impulse

Momentum:

                  Moving object possesses a quality virtue of which it experts a force on anything that tries to stop it.The faster the object is traveling, the harder to stop it.If two object moves with same velocity, then it is difficult to stop the massive of the two.
By Newton, this quality of moving body was called the quantity of motion of the body. this is now called linear momentum of body.

Definition of momentum:

                  the product of mass and velocity of body is called linear momentum.

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what is physics definition

The branch of science which deals with the study  of matter and energy and the relationship between them is called physics.

we can also called about what is physics  The study of physics involves investigation of such things as the laws of motion,the structure of space and time,the nature and type of forces that hold different materials
together, the interaction between different particles, the interaction of electromagnetic radiation with matter and so on.

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