what is concept of centripetal force and define centripetal acceleration

Centripetal Force

               The force needed to bend normally straight path of particle into circular path is called centripetal                                                  

                     force.It is denoted by Fc.

Centripetal force formula

                                               

                                         It is also known as inward force or center seeking force.

Explanation

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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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