Work and Energy
Work :
What is work?
work can be defined as transfer of energy . In physics
we say that work is done on an object when you transfer energy to that object .
work is the application
of a force over a distance.
w = fS.s work formula is :
w = work
f = forc
Example :
moving an object with a force of one newton for a distance
of one meter equal one joule of work .
joule is a unit that measures work
work – Energy principle :
the change in
the kinetic Energy of an object is equal to the net work done on the object.
Energy :
what is Energy ?
can be defined as the capacity
for doing work .
The energy of
a moving object is called Kinetic energy . for an object of mass m
,moving with velocity of magnitude v , this energy can be calculated from the
formula E=1/2 m
v2
Types of energy :
there are two types of energy in many forms :
kinetic energy = Energy of motion -
potential energy = Stored Energy -
Examples of kinetic Energy and potential energy :
Power:
what is power ?
Power is the rate at which work is done.
It is the work/time ratio. Mathematically, it is computed using the following equation.
Power = Work / time
or
P = W / t
The standard metric unit of power is the Watt. As is implied by the equation for power, a unit of power is equivalent to a unit of work divided by a unit of time.
Thus, a Watt is equivalent to a Joule/second. For historical reasons, the horsepower is occasionally used to describe the power delivered by a machine. One horsepower is equivalent to approximately 750 Watts.
We hope that you like this topic .
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