SlideShare a Scribd company logo
1 of 20
WORK & ENERGYWORK & ENERGY
AYUSHMAAN MAHESWARI
VISHALTRIPATHI
ROHAN BAGHEL
ANUJ CHAUHAN
CLASS- 9 B
GROUP NO.- 3
G.L.T. SARASWATI BAL MANDIR
INDEX:-INDEX:-
1. WORK
2. ENERGY
i. KINETIC ENERGY
ii. POTENTIAL ENERGY
3. POWER
1.1. WORK:-WORK:-
Work is said to be done only when a
force act on an object which displaces it
or which causes the object to move.
Work done = Force x Displacement
 W = F s
where W= work done
F = force
s = Displacement
In the SI system, the units of work are
joules.
1 J = 1 Nm.
E.g.-
W=F s
W=100 N*5m
W=500Nm
Energy:-Energy:-
ENERGY is the capability of doing
work.
An object having the capability to do
work is said to posses energy.
The object which does the work loses
energy and the object on which the
work is done gains energy.
Any object that possesses energy can
do work.
The unit of energy is the same as that of
work. i.e. joule (J)
Different forms of ENERGY.-
1.Mechanical Energy
(Potential Energy + Kinetic Energy)
2.Heat Energy
3.Chemical Energy
4.Electrical Energy
5.Light Energy
1.1. Kinetic Energy:-Kinetic Energy:-
The kinetic energy of an object is
the energy which it possesses due to
its motion.
We define the kinetic energy:-
∆KE = W = F x d= m a h=1/2 mv2
• If the net work is positive, the kinetic
energy increases.
• If the net work is negative, the kinetic
energy decreases.
e.g.-
Find the kinetic energy of an 4 Kg object moving
at 5m/s.
KE = 1/2 mv2
KE = ½ (4Kg)(5m/s) 2
KE = 50 Kg m 2
/s 2
KE = 50 J
2.2. POTENTIAL ENERGY:-POTENTIAL ENERGY:-
Potential energy is energy that is stored
within a system.
This force is often called a restoring force. 
 PE = W = F x d = m a h
Familiar examples of potential energy:
• A wound-up spring
• A stretched elastic band
• An object at some height above the ground
In raising a mass m to
a height h, the work
done by the external
force is
Therefore define the
gravitational potential
energy:
The energy of motion
∆KE = W = F x d = m a h=1/2 mv2
Find the kinetic energy of an 4 Kg object
moving at 5m/s.
KE = 1/2 mv2
KE = ½ (4Kg)(5m/s) 2
KE = 50 Kg m 2
/s 2
KE = 50 J
Potential energy can also be stored in a
spring when it is compressed; the figure
below shows potential energy yielding
kinetic energy.
The force required to
compress or stretch a
spring is:
where k is called the
spring constant, and
needs to be measured
for each spring.
If there are no non-conservative forces, the
sum of the changes in the kinetic energy and
in the potential energy is zero – the kinetic
and potential energy changes are equal but
opposite in sign.
This allows us to define the total mechanical
energy:
Potential Energy is maximum at
the maximum HEIGHT
Law of conservation of energyLaw of conservation of energy
Energy cannot be
created or
destroyed; hence
energy can not
disappear.
POWER:-POWER:-
Power is the rate that we use energy.
Power = Work or Energy / Time
P = W/t = F x d/t = F v
The units for power :
◦ J/s
◦ Kg m2
/ s2
/s
◦ N m / s
In the SI system, the units of power are watts:
A 5 Kg Cart is pushed by a 30 N force against
friction for a distance of 10m in 5 seconds.
Determine the Power needed to move the
cart.
P = F x d / t
P = 30 N (10 m) / 5 s
P = 60 N m /s
P = 60 watts
Power is also needed for acceleration and for
moving against the force of gravity.
The average power can be written in terms
of the force and the average velocity:
THANK YOUTHANK YOU

More Related Content

What's hot

Ppt on work energy and power class xi science
Ppt on work energy and power class xi sciencePpt on work energy and power class xi science
Ppt on work energy and power class xi scienceacceleration gravity
 
O level work energy and power
O level work energy and powerO level work energy and power
O level work energy and powerChen Gong
 
Work energy theorem summary 7 may 2015
Work energy theorem summary 7 may 2015Work energy theorem summary 7 may 2015
Work energy theorem summary 7 may 2015Mphiriseni Khwanda
 
Chapter 6 Work Energy Power
Chapter 6 Work Energy PowerChapter 6 Work Energy Power
Chapter 6 Work Energy Powermoths
 
AP Physics - Chapter 6 Powerpoint
AP Physics - Chapter 6 PowerpointAP Physics - Chapter 6 Powerpoint
AP Physics - Chapter 6 PowerpointMrreynon
 
Work, energy & power physics
Work, energy & power physics Work, energy & power physics
Work, energy & power physics sashrilisdi
 
Power, non conservative and conservative forces
Power, non conservative and conservative forcesPower, non conservative and conservative forces
Power, non conservative and conservative forcesRG Luis Vincent Gonzaga
 
work energy power for class ix
work energy power for class ixwork energy power for class ix
work energy power for class ixnra123
 

What's hot (15)

Ppt on work energy and power class xi science
Ppt on work energy and power class xi sciencePpt on work energy and power class xi science
Ppt on work energy and power class xi science
 
Work Energy & power
Work Energy & powerWork Energy & power
Work Energy & power
 
O level work energy and power
O level work energy and powerO level work energy and power
O level work energy and power
 
Energy, work and power
Energy, work and powerEnergy, work and power
Energy, work and power
 
Work & Energy
Work & EnergyWork & Energy
Work & Energy
 
Work energy theorem summary 7 may 2015
Work energy theorem summary 7 may 2015Work energy theorem summary 7 may 2015
Work energy theorem summary 7 may 2015
 
Chapter 6 Work Energy Power
Chapter 6 Work Energy PowerChapter 6 Work Energy Power
Chapter 6 Work Energy Power
 
Work and energy
Work and energyWork and energy
Work and energy
 
AP Physics - Chapter 6 Powerpoint
AP Physics - Chapter 6 PowerpointAP Physics - Chapter 6 Powerpoint
AP Physics - Chapter 6 Powerpoint
 
Work, energy & power physics
Work, energy & power physics Work, energy & power physics
Work, energy & power physics
 
Power, non conservative and conservative forces
Power, non conservative and conservative forcesPower, non conservative and conservative forces
Power, non conservative and conservative forces
 
work energy power for class ix
work energy power for class ixwork energy power for class ix
work energy power for class ix
 
Energy, work, power
Energy, work, powerEnergy, work, power
Energy, work, power
 
Work, energy and power
Work, energy and powerWork, energy and power
Work, energy and power
 
Work and energy
Work and energyWork and energy
Work and energy
 

Viewers also liked

Viewers also liked (18)

Trigonometry
TrigonometryTrigonometry
Trigonometry
 
Vijender x
Vijender xVijender x
Vijender x
 
Paper presentation anita_mam[1]
Paper presentation anita_mam[1]Paper presentation anita_mam[1]
Paper presentation anita_mam[1]
 
Carbon cycle (ANIMATED)
Carbon cycle (ANIMATED)Carbon cycle (ANIMATED)
Carbon cycle (ANIMATED)
 
Soil(3)
Soil(3)Soil(3)
Soil(3)
 
Solarsystemppt
SolarsystempptSolarsystemppt
Solarsystemppt
 
S.s.t. ppt
S.s.t. pptS.s.t. ppt
S.s.t. ppt
 
Structure of atomic
Structure of atomicStructure of atomic
Structure of atomic
 
G&a (1)
G&a (1)G&a (1)
G&a (1)
 
Sanskrit deepesh 9 f
Sanskrit deepesh 9 fSanskrit deepesh 9 f
Sanskrit deepesh 9 f
 
Trigonometry
TrigonometryTrigonometry
Trigonometry
 
Aditya,akshit & our mam
Aditya,akshit & our mamAditya,akshit & our mam
Aditya,akshit & our mam
 
Chemistry
ChemistryChemistry
Chemistry
 
Trigonometry maths x vikas kumar
Trigonometry maths x  vikas kumarTrigonometry maths x  vikas kumar
Trigonometry maths x vikas kumar
 
Issue of Shares
Issue of SharesIssue of Shares
Issue of Shares
 
Science ppt
Science pptScience ppt
Science ppt
 
Alankar
AlankarAlankar
Alankar
 
Hidi ppt h 01
Hidi ppt h 01Hidi ppt h 01
Hidi ppt h 01
 

Similar to WORK & ENERGY GUIDE

Work and Energy ZOOM.pptx
Work and Energy ZOOM.pptxWork and Energy ZOOM.pptx
Work and Energy ZOOM.pptxWaelAbuNijem2
 
11workandenergy-150809064825-lva1-app6891.pdf
11workandenergy-150809064825-lva1-app6891.pdf11workandenergy-150809064825-lva1-app6891.pdf
11workandenergy-150809064825-lva1-app6891.pdfSABAKHAN478855
 
11workandenergy(1).pdf for environmental science
11workandenergy(1).pdf for environmental science11workandenergy(1).pdf for environmental science
11workandenergy(1).pdf for environmental scienceKrishivSharma8
 
2.3 work, energy & power 2017
2.3 work, energy & power 20172.3 work, energy & power 2017
2.3 work, energy & power 2017Paula Mills
 
WEEK_7_WORKPOWER_AND_ENERGY_PPT.pptx
WEEK_7_WORKPOWER_AND_ENERGY_PPT.pptxWEEK_7_WORKPOWER_AND_ENERGY_PPT.pptx
WEEK_7_WORKPOWER_AND_ENERGY_PPT.pptxMayFrailynDubria
 
class 9 chapter 11 work and energy very helpful presentation
class 9 chapter 11 work and energy very helpful presentationclass 9 chapter 11 work and energy very helpful presentation
class 9 chapter 11 work and energy very helpful presentationStainich Shivansh
 
T - Work, Power & Energy
T - Work, Power & EnergyT - Work, Power & Energy
T - Work, Power & EnergyMahendra Rajak
 
Ch 6 Work & Energy
Ch 6 Work & EnergyCh 6 Work & Energy
Ch 6 Work & EnergyScott Thomas
 
Lecture Ch 06
Lecture Ch 06Lecture Ch 06
Lecture Ch 06rtrujill
 
Work and Energy.pptx [repaired]
Work and Energy.pptx [repaired]Work and Energy.pptx [repaired]
Work and Energy.pptx [repaired]micaela ongan
 
02 UNIT-2 (WORK & ENERGY) .pptx
02 UNIT-2 (WORK & ENERGY) .pptx02 UNIT-2 (WORK & ENERGY) .pptx
02 UNIT-2 (WORK & ENERGY) .pptxFatimaAfzal56
 

Similar to WORK & ENERGY GUIDE (20)

Slide1
Slide1Slide1
Slide1
 
Work and Energy ZOOM.pptx
Work and Energy ZOOM.pptxWork and Energy ZOOM.pptx
Work and Energy ZOOM.pptx
 
11workandenergy-150809064825-lva1-app6891.pdf
11workandenergy-150809064825-lva1-app6891.pdf11workandenergy-150809064825-lva1-app6891.pdf
11workandenergy-150809064825-lva1-app6891.pdf
 
work and energy
work and energywork and energy
work and energy
 
11workandenergy(1).pdf for environmental science
11workandenergy(1).pdf for environmental science11workandenergy(1).pdf for environmental science
11workandenergy(1).pdf for environmental science
 
Work power and Energy
Work  power and EnergyWork  power and Energy
Work power and Energy
 
Work and Energy
Work and EnergyWork and Energy
Work and Energy
 
2.3 work, energy & power 2017
2.3 work, energy & power 20172.3 work, energy & power 2017
2.3 work, energy & power 2017
 
WEEK_7_WORKPOWER_AND_ENERGY_PPT.pptx
WEEK_7_WORKPOWER_AND_ENERGY_PPT.pptxWEEK_7_WORKPOWER_AND_ENERGY_PPT.pptx
WEEK_7_WORKPOWER_AND_ENERGY_PPT.pptx
 
class 9 chapter 11 work and energy very helpful presentation
class 9 chapter 11 work and energy very helpful presentationclass 9 chapter 11 work and energy very helpful presentation
class 9 chapter 11 work and energy very helpful presentation
 
T - Work, Power & Energy
T - Work, Power & EnergyT - Work, Power & Energy
T - Work, Power & Energy
 
Work and energy
Work and energyWork and energy
Work and energy
 
Work-and-Energy.pptx
Work-and-Energy.pptxWork-and-Energy.pptx
Work-and-Energy.pptx
 
work and energy
work and energywork and energy
work and energy
 
Ch 6 Work & Energy
Ch 6 Work & EnergyCh 6 Work & Energy
Ch 6 Work & Energy
 
Lecture Ch 06
Lecture Ch 06Lecture Ch 06
Lecture Ch 06
 
Third ppt
Third pptThird ppt
Third ppt
 
Work and Energy.pptx [repaired]
Work and Energy.pptx [repaired]Work and Energy.pptx [repaired]
Work and Energy.pptx [repaired]
 
Work and energy
Work  and  energyWork  and  energy
Work and energy
 
02 UNIT-2 (WORK & ENERGY) .pptx
02 UNIT-2 (WORK & ENERGY) .pptx02 UNIT-2 (WORK & ENERGY) .pptx
02 UNIT-2 (WORK & ENERGY) .pptx
 

More from Poonam Singh (20)

Diabetes
DiabetesDiabetes
Diabetes
 
Polynomials
PolynomialsPolynomials
Polynomials
 
Advertising
Advertising Advertising
Advertising
 
old age
old ageold age
old age
 
Diabetes mellitus
Diabetes mellitusDiabetes mellitus
Diabetes mellitus
 
WATER CRISIS “Prediction of 3rd world war”
WATER CRISIS “Prediction of 3rd world war”WATER CRISIS “Prediction of 3rd world war”
WATER CRISIS “Prediction of 3rd world war”
 
My experience my values 7th
My experience my values 7thMy experience my values 7th
My experience my values 7th
 
Solid
SolidSolid
Solid
 
Smart class
Smart classSmart class
Smart class
 
S107
S107S107
S107
 
S104
S104S104
S104
 
Mera anubhav meri siksha 7th
Mera anubhav meri siksha 7thMera anubhav meri siksha 7th
Mera anubhav meri siksha 7th
 
S103
S103S103
S103
 
S102
S102S102
S102
 
S101
S101S101
S101
 
Projectile motion
Projectile motionProjectile motion
Projectile motion
 
Mansi
MansiMansi
Mansi
 
Gravitation
GravitationGravitation
Gravitation
 
From the begning
From the begningFrom the begning
From the begning
 
English aphotograph
English aphotographEnglish aphotograph
English aphotograph
 

WORK & ENERGY GUIDE

  • 1. WORK & ENERGYWORK & ENERGY AYUSHMAAN MAHESWARI VISHALTRIPATHI ROHAN BAGHEL ANUJ CHAUHAN CLASS- 9 B GROUP NO.- 3 G.L.T. SARASWATI BAL MANDIR
  • 2. INDEX:-INDEX:- 1. WORK 2. ENERGY i. KINETIC ENERGY ii. POTENTIAL ENERGY 3. POWER
  • 3. 1.1. WORK:-WORK:- Work is said to be done only when a force act on an object which displaces it or which causes the object to move. Work done = Force x Displacement  W = F s where W= work done F = force s = Displacement
  • 4. In the SI system, the units of work are joules. 1 J = 1 Nm. E.g.- W=F s W=100 N*5m W=500Nm
  • 5. Energy:-Energy:- ENERGY is the capability of doing work. An object having the capability to do work is said to posses energy. The object which does the work loses energy and the object on which the work is done gains energy. Any object that possesses energy can do work.
  • 6. The unit of energy is the same as that of work. i.e. joule (J) Different forms of ENERGY.- 1.Mechanical Energy (Potential Energy + Kinetic Energy) 2.Heat Energy 3.Chemical Energy 4.Electrical Energy 5.Light Energy
  • 7. 1.1. Kinetic Energy:-Kinetic Energy:- The kinetic energy of an object is the energy which it possesses due to its motion. We define the kinetic energy:- ∆KE = W = F x d= m a h=1/2 mv2
  • 8. • If the net work is positive, the kinetic energy increases. • If the net work is negative, the kinetic energy decreases. e.g.- Find the kinetic energy of an 4 Kg object moving at 5m/s. KE = 1/2 mv2 KE = ½ (4Kg)(5m/s) 2 KE = 50 Kg m 2 /s 2 KE = 50 J
  • 9. 2.2. POTENTIAL ENERGY:-POTENTIAL ENERGY:- Potential energy is energy that is stored within a system. This force is often called a restoring force.   PE = W = F x d = m a h Familiar examples of potential energy: • A wound-up spring • A stretched elastic band • An object at some height above the ground
  • 10. In raising a mass m to a height h, the work done by the external force is Therefore define the gravitational potential energy:
  • 11. The energy of motion ∆KE = W = F x d = m a h=1/2 mv2 Find the kinetic energy of an 4 Kg object moving at 5m/s. KE = 1/2 mv2 KE = ½ (4Kg)(5m/s) 2 KE = 50 Kg m 2 /s 2 KE = 50 J
  • 12. Potential energy can also be stored in a spring when it is compressed; the figure below shows potential energy yielding kinetic energy.
  • 13. The force required to compress or stretch a spring is: where k is called the spring constant, and needs to be measured for each spring.
  • 14. If there are no non-conservative forces, the sum of the changes in the kinetic energy and in the potential energy is zero – the kinetic and potential energy changes are equal but opposite in sign. This allows us to define the total mechanical energy:
  • 15. Potential Energy is maximum at the maximum HEIGHT
  • 16. Law of conservation of energyLaw of conservation of energy Energy cannot be created or destroyed; hence energy can not disappear.
  • 17. POWER:-POWER:- Power is the rate that we use energy. Power = Work or Energy / Time P = W/t = F x d/t = F v The units for power : ◦ J/s ◦ Kg m2 / s2 /s ◦ N m / s
  • 18. In the SI system, the units of power are watts: A 5 Kg Cart is pushed by a 30 N force against friction for a distance of 10m in 5 seconds. Determine the Power needed to move the cart. P = F x d / t P = 30 N (10 m) / 5 s P = 60 N m /s P = 60 watts
  • 19. Power is also needed for acceleration and for moving against the force of gravity. The average power can be written in terms of the force and the average velocity: