different forms of energy Flashcards
define mechanical energy ?
Energy possessed by a body due to its state of motion or rest
two forms of mechanical energy ?
potential and kinetic energy
define potential ?
energy possessed by body at rest due to its position , size or state
potential energy denoted by
U
forms of potential energy ?
gravitational and elastic potential energy
force of attraction due to earth is called -
gravitational potential energy
force of attraction due to earth is called -
gravitational potential energy or weight of the body
define gravitational potential energy ?
potential energy possessed by body due to force of attraction by earth
when object is in infinite point Gravitational potential energy is
zero
Gravitational potential energy of a body equal to
amount of work done by force of attraction
by earth in bringing the object from infinite point
Gravitational potential energy of body is negative why?
work done by force of gravity itself , so at finite distance from earth Gravitational potential energy is negative
as a distance of body from earth increases force of attraction __________
decreases
force of attraction decreases
Gravitational potential energy __________.
increases
define Elastic potential energy
when a external force is applied to a non rigid body it get deformed due to change in shape and size
on removal of Elastic potential energy what will happen to the object ?
it regains its original form
on removal of Elastic potential energy body regains it original form its due to
property of elasticity
what will happen to the external force acted on the body
it gets stored in the body in form of Elastic potential energy
potential energy possessed by a body in deformed state [ change in shape and size ]
Elastic potential energy
amount of work done in deforming the body is -
Elastic potential energy
gravitational potential energy is represented by -
U
formula for Gravitational potential energy -
U=MGH
gravitational potential energy measured as
amount of work done in lifting it up against force of gravity to that height
when is at the height _____ stored in a body
gravitational potential energy
height from the ground increases
potential energy _______
increases
height from the ground decreases
potential energy _______
decreases
gain in potential energy formula -
mg[h2-h1]
loss in potential energy formula -
mg[ h1-h2]
kinetic energy define -
energy possessed by body due to its state of motion
kinetic energy denoted by
k
kinetic energy possessed by a moving body is equal to amount of work __________
amount of work which a moving body can do before rest
retarding force formula
f= m*a - a=retardation
displacement formula - [in respect to velocity , retardation]
s = v^2 /2a
average speed =
s/t
v^2 =
v^2 = u^2 + 2aS
kinetic energy formula -
k - 1/2 * mv^2
on doubling the velocity of motion of the body - kinetic energy becomes _____
four times
momentum = [ formula]
p = mv
relationship btw momentum and kinetic energy - [ formula]
p^2 = 2mK , K = p^2 /2m
WORK ENERGY THEOREM - [DEFINE ]
increase in kinetic energy = to work done by the force on moving body in direction of the body
formula for displacement from this equation v^2=u^2 + 2aS
v^2 + u^2 / 2a = S
according to work energy theorem - work done on the body is = _________
increase in kinetic energy
Translational motion means
motion of the body in straight line
translational kinetic energy -
kinetic energy of the body due to its motion in straight line
molecule of monoatomic gas has _________ energy
translational kinetic energy
rotational kinetic energy -
kinetic energy of the body due to its rotational motion
atoms of moving diatomic possess _________ energies
translational , vibrational and rotational energies
diatomic molecules rotate about _________
fixed axis
vibrational kinetic energy -
kinetic energy of body due to vibrational motion
rolling ball has ________ kinetic energies
rotational and translational
potential energy changes only has
kinetic energy
Nuclear energy -
energy possessed due to loss in mass during nuclear fission fusion .
what is thermocouple ?
thermocouple changes heat energies into electrical energies
thermocouple is a two junction of two different metals kept at different temp
dissipation of energies means
conversion of energies into undesirable form
according to principle of conservation of energies -
energy can neither be created nor can be destroyed. It only changes from one form to another
at ground level in an object potential energy will be
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