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Work Energy Power > different forms of energy > Flashcards

different forms of energy Flashcards

1
Q

define mechanical energy ?

A

Energy possessed by a body due to its state of motion or rest

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2
Q

two forms of mechanical energy ?

A

potential and kinetic energy

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3
Q

define potential ?

A

energy possessed by body at rest due to its position , size or state

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4
Q

potential energy denoted by

A

U

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5
Q

forms of potential energy ?

A

gravitational and elastic potential energy

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6
Q

force of attraction due to earth is called -

A

gravitational potential energy

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6
Q

force of attraction due to earth is called -

A

gravitational potential energy or weight of the body

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7
Q

define gravitational potential energy ?

A

potential energy possessed by body due to force of attraction by earth

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8
Q

when object is in infinite point Gravitational potential energy is

A

zero

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9
Q

Gravitational potential energy of a body equal to

A

amount of work done by force of attraction

by earth in bringing the object from infinite point

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10
Q

Gravitational potential energy of body is negative why?

A

work done by force of gravity itself , so at finite distance from earth Gravitational potential energy is negative

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11
Q

as a distance of body from earth increases force of attraction __________

A

decreases

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12
Q

force of attraction decreases

Gravitational potential energy __________.

A

increases

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13
Q

define Elastic potential energy

A

when a external force is applied to a non rigid body it get deformed due to change in shape and size

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14
Q

on removal of Elastic potential energy what will happen to the object ?

A

it regains its original form

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15
Q

on removal of Elastic potential energy body regains it original form its due to

A

property of elasticity

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16
Q

what will happen to the external force acted on the body

A

it gets stored in the body in form of Elastic potential energy

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16
Q

potential energy possessed by a body in deformed state [ change in shape and size ]

A

Elastic potential energy

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16
Q

amount of work done in deforming the body is -

A

Elastic potential energy

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16
Q

gravitational potential energy is represented by -

A

U

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17
Q

formula for Gravitational potential energy -

A

U=MGH

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18
Q

gravitational potential energy measured as

A

amount of work done in lifting it up against force of gravity to that height

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19
Q

when is at the height _____ stored in a body

A

gravitational potential energy

20
Q

height from the ground increases

potential energy _______

A

increases

21
Q

height from the ground decreases

potential energy _______

A

decreases

22
Q

gain in potential energy formula -

A

mg[h2-h1]

23
Q

loss in potential energy formula -

A

mg[ h1-h2]

24
Q

kinetic energy define -

A

energy possessed by body due to its state of motion

25
Q

kinetic energy denoted by

A

k

26
Q

kinetic energy possessed by a moving body is equal to amount of work __________

A

amount of work which a moving body can do before rest

27
Q

retarding force formula

A

f= m*a - a=retardation

28
Q

displacement formula - [in respect to velocity , retardation]

A

s = v^2 /2a

29
Q

average speed =

A

s/t

30
Q

v^2 =

A

v^2 = u^2 + 2aS

31
Q

kinetic energy formula -

A

k - 1/2 * mv^2

32
Q

on doubling the velocity of motion of the body - kinetic energy becomes _____

A

four times

33
Q

momentum = [ formula]

A

p = mv

34
Q

relationship btw momentum and kinetic energy - [ formula]

A

p^2 = 2mK , K = p^2 /2m

35
Q

WORK ENERGY THEOREM - [DEFINE ]

A

increase in kinetic energy = to work done by the force on moving body in direction of the body

36
Q

formula for displacement from this equation v^2=u^2 + 2aS

A

v^2 + u^2 / 2a = S

37
Q

according to work energy theorem - work done on the body is = _________

A

increase in kinetic energy

38
Q

Translational motion means

A

motion of the body in straight line

39
Q

translational kinetic energy -

A

kinetic energy of the body due to its motion in straight line

40
Q

molecule of monoatomic gas has _________ energy

A

translational kinetic energy

41
Q

rotational kinetic energy -

A

kinetic energy of the body due to its rotational motion

42
Q

atoms of moving diatomic possess _________ energies

A

translational , vibrational and rotational energies

42
Q

diatomic molecules rotate about _________

A

fixed axis

43
Q

vibrational kinetic energy -

A

kinetic energy of body due to vibrational motion

44
Q

rolling ball has ________ kinetic energies

A

rotational and translational

45
Q

potential energy changes only has

A

kinetic energy

46
Q

Nuclear energy -

A

energy possessed due to loss in mass during nuclear fission fusion .

47
Q

what is thermocouple ?

A

thermocouple changes heat energies into electrical energies

thermocouple is a two junction of two different metals kept at different temp

48
Q

dissipation of energies means

A

conversion of energies into undesirable form

49
Q

according to principle of conservation of energies -

A

energy can neither be created nor can be destroyed. It only changes from one form to another

50
Q

at ground level in an object potential energy will be

A

0

Work Energy Power (5 decks)

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