3. WORK
energy and power WORK is defined as product of the
force and displacement of an object in the direction of
force Displacement .. Formula of work is W=Fxs
F= Force in Newton
s = Displacement in meters
Unit of work is Joule
4. ENERGY
Energy is defined as CAPACITY TO DO WORK. SI Unit : Joule (J) Many
form. Common one:
Kinetic
Potential
Electric
Chemical
Solar
Nuclear
7. ELASTIC POTENTIAL ENERGY
Elastic energy is the potential mechanical energy stored in the configuration
of a material or physical system as work is performed to distort its
volume or shape. Elastic energy occurs when objects are compressed and
stretched. Elasticity theory primarily develops a very complicated system
with an analytical understanding of the mechanics of solid bodies and
materials.[1] The elastic potential energy equation is used in calculations
of positions of mechanical equilibrium. The energy is potential as it will
be converted into another form of energy, such as kinetic.
Mathematically, the equation can be stated as:
8. LAW OF CONSERVATION OF ENERGY
the law of conservation of energy states that the
total energy of an isolated system cannot change—it
is said to beconserved over time. Energy can be
neither created nor destroyed, but can change form,
for instance chemical energy can
beconverted to kinetic energy in the explosion of a
stick of dynamite
9. POWER
Power The rate at which work is done. The rate at which done. energy
is expended. expended. Power is the amount of work done divided
by the time it takes to do it. it. Power is the energy expended
divided by the time it takes to expend it. it. Power (watts) = Work
(joules) Power (watts) = Energy (joules) Time (sec) Time (sec)
James Watt ; 1 horsepower = 550 ft-lb of work/second = 746 watts
or 0.746 kilowatt
10. CENTRIPETAL ACCELERATION
Centripetal acceleration, property of the motion of a
body traversing a circular path. The acceleration is
directed radially toward the centre of the circle and
has a magnitude equal to the square of the body’s
speed along the curve divided by the distance from
the centre of the circle to the moving body. The force
causing this acceleration is directed also toward the
centre of the circle and is named centripetal force
