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Home KPK NOTES Class 11 KPK Notes Physics class 11 notes

KPK G11 Physics Chapter 4 (Work and Energy) – Class 11

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KPK G11 Physics Chapter 4 (Work and Energy). All the intermediate level students I who are looking for English subject preparation can find a better solution here. This is because here they can find 11th class English study notes.

Q.1) A bucket is taken to the bottom of a well, does the bucket possess any P.E Explain?

Table of Contents

  • Q.1) A bucket is taken to the bottom of a well, does the bucket possess any P.E Explain?
  • Q.2) When an arrow is shot from its bow, it has k.E. From where does it get the k.E?
  • Q.3) Does a hydrogen filled balloon possess any P.E? Explain? 
  • Q.4) Is K.E a vector quantity? 
  • Q.5) What happens to K.E of a bullet when it penetrates into a target? 
  • Q.6) Does the tension in the string of a swinging pendulum do any work? Explain.
  • Q.7) A meteor when enters into the earth’s atmosphere burns. What happens to its energy?
  • Q.8) What type of energy is stored in the spring of watch? 
  • Q.9) A man drops a cup from a certain height, which breaks into pieces. What energy changes are involved?
  • Q.10) A man rowing boat upstream is at rest with respect to shore, is he doing work? 
  • Q.11) Why energy savers are used instead of normal bulbs? 
  • Q.1) Define work and show that it is the dot product of force and displacement. At what conditions work done will be maximum or minimum?
  • Q.6) Describe briefly various non-conventional sources of energy. 
  • Physics: Work and Energy
  • TopicWork and energy
  • Types of energy
  • What is work?
  • What is energy?
  • What does work do?
  • How is work related to energy?
  • How is energy measured?
  • Conclusion

Answer:
Yes, a bucket does possess the potential energy.
When we lower the bucket to the bottom of the well, water exerts a thrust on the bucket in the upward direction. So, we have to do some work against that upthrust of water to take the bucket to bottom of well. This work done is stored in form of potential energy in the bucket. So, we can say that bucket possess negative of potential energy if we take the ground level as a reference level.

Q.2) When an arrow is shot from its bow, it has k.E. From where does it get the k.E?

Answer:
When we stretch the string of the bow to shot the arrow, some work is done on the bow. This work done is stored in the bow in form of elastic potential energy.
When we release the string of the bow and shot the arrow, the stored P.E of the bow will convert in form of K.E of arrow making it capable of moving in the forward direction.
So, we can say that the arrow gets its K.E from the P.E of the bow.

Read more: KPK G11 Physics Chapter 3 Notes (Motion and Force)

Q.3) Does a hydrogen filled balloon possess any P.E? Explain? 

Answer:
Yes, a hydrogen filled balloon does possess P.E.
Hydrogen is a lighter gas than air, so when we fill a balloon with hydrogen gas and release it in air, it starts moving upward against the gravitational field.
So, due to upthrust of air on the balloon, some work is done on the balloon which will store in form of P.E in balloon.

Q.4) Is K.E a vector quantity? 

Answer:
No, K.E is not a vector quantity. It is a scalar quantity.
As K.E is given by,

ke
KPK G11 Physics Chapter 4 (Work and Energy) - Class 11 4

Where “m” represents the mass of an object which is a scalar quantity and “v2” represents the magnitude of the velocity of the object which is also a scalar quantity. That’s why K.E is also a scalar quantity. 

Q.5) What happens to K.E of a bullet when it penetrates into a target? 

Answer:
K.E of the bullet become smaller and smaller as it penetrates to the target.
When a bullet penetrates to a target, target exerts a resisting force on the bullet. Some of K.E of the bullet is used to overcome that resisting force offered by the target. While some part of K.E converts into other forms of energy such as sound energy.

Q.6) Does the tension in the string of a swinging pendulum do any work? Explain.

Answer:
Work done is defined as the product of the force applied to a body and the displacement covered in the direction of the force; i.e.
                                                       W = F.d = Fdcosθ
In case of swinging pendulum, the tension in the string is directed upward which the bob swings in the direction perpendicular to the tension i.e the angle between them is 900.
Thus eq(i) becomes;
                                                       W = Fdcos(90) = Fd(0) = 0
This shows that there is no work done in case of string swinging pendulum.

Q.7) A meteor when enters into the earth’s atmosphere burns. What happens to its energy?

Answer:
There are particles in the air. When a meteor enters into the atmosphere of earth, it burns due to friction between air particles and meteor.
When a meteor collides with air particles some of its energy is transferred to air particles. Some of the energy possessed by the meteor is used to overcome the friction offered by the air particles while a part of it is also converted into heat energy and light energy which results in the loss of its energy.

Q.8) What type of energy is stored in the spring of watch? 

Answer:
Elastic potential energy is stored in spring of watch and is given by;

pe
KPK G11 Physics Chapter 4 (Work and Energy) - Class 11 5

Where “k” is the spring constant and “x” is displacement. 

Q.9) A man drops a cup from a certain height, which breaks into pieces. What energy changes are involved?

Answer:
When a man drops a cup from a certain height, its P.E decreases and it converts into K.E.
When it strikes to the ground it breaks into pieces and produces noise. Hence some of its K.E converts into sound energy and some into heat energy while the remaining will get distributed into K.E of pieces of the cup.

Q.10) A man rowing boat upstream is at rest with respect to shore, is he doing work? 

Answer:
No, there is no work done by the man while he is at rest with respect to the shore.
According to the definition of work done,
                                                        W = Force.displacement
                                                        W = F.d
As the man is at rest so there is no displacement i.e. d = 0,
                                                        W = F.0 = 0
⇒                                                      W = 0
This shows that there is no work done by the man rowing boat but at rest with respect to shore.

Q.11) Why energy savers are used instead of normal bulbs? 

Answer:
We use energy savers instead of normal bulbs due to following reasons:
1. Energy savers consume less energy as compared to normal bulbs.
2. They produce a very small amount of heat than normal bulbs
3. Light produced by energy savers is of high intensity and power as compared to normal bulbs.
4.   These are long-lasting than normal bulbs.

Q.1) Define work and show that it is the dot product of force and displacement. At what conditions work done will be maximum or minimum?

Answer:
Definition:

                         “Work is scalar product of force and displacement”

It can also be defined as;

“The product of the displacement and the components of the force in the direction of displacement”

Work is done by both constant force as well as variable force.

Explanation:
Consider a force ‘F’ applied on a body, making an angle ‘θ’ with the horizontal as shown in the figure. Then by resolving force into its components, we can see from the figure that the body is displaced by force Fx, so work is done by Fx.

ke 1
KPK G11 Physics Chapter 4 (Work and Energy) - Class 11 6

W = F.d
                                                     W = Fxd = (Fcosθ) d = Fd cosθ
The above equation can also be obtained by resolving d into its components keeping F and θ constant such that;
                                                W = Fdx = F(dcosθ) = Fdcosθ
So, we get work done as
Work Done = (magnitude of force)(magnitude of displacement)(cosine of the angle between F and d)

Conditions for maximum and minimum work done:

Work equation tells us that,
1. Greater the applied force F, greater will be the work done provided “d” and “θ” are kept constant.
2. Greater the distance d, greater will be the work done provided force F and θ are kept constant.
3. Maximum Work: When θ = 0° , then W = Fdcosθ = Fdcos0° = Fd. So, work done will be maximum for θ = 0°
4. Minimum Work: When θ = 90° , then W = Fdcosθ = Fdcos90° = 0. So work done will be minimum for θ = 90° .
5. Negative Work: When θ = 180° , then W = Fdcos180° = -Fd. So work done will be negative for θ = 180°.

Q.6) Describe briefly various non-conventional sources of energy. 

Answer:
Definition:
“Non-conventional energy sources are those sources, which are ecologically safe and renewable.”
Some of non-conventional energy sources are the sun, the winds, tides, geothermal energy, biomass, farm, and animal waste etc

ADVERTISEMENT

1. Energy from Biomass:
 
Biomass is usually referred as garbage, some of these are usually found around us as dead trees, tree branches, left-over crops, wood chips, and bark, used tires etc.
 Trucks bring garbage to the power plant where they fed to the furnace to burn. The heat produced is then used to boil water and energy of steam to run turbines and generators. In another procedure, Garbage is decomposed to produce methane, which can be burned right at the form to make energy to run farms.

2. Energy from Waves:
 
The ocean is a very good source of a large amount of energy produced by sun and wind. This makes wave energy a potential power platform. Waves of larger amplitude have a larger amount of energy, which is a stored form of solar energy. Winds that produce waves are caused by the pressure differences in atmosphere arising due to solar heating.

3. Geothermal Energy:
 
Source of geothermal energy is a result of sun rays striking to surface of the earth. Another source is the center of the earth, which is almost 4000 degree Celsius. This large amount of energy has a capability to burn rocks so this warm surface of the earth as well. Volcanic areas are specifically are a very significant source of energy.

4. Nuclear Energy:
 
Sun and stars are tireless sources of energy. This energy result due to nuclear reactions that take place in stars and sun, converting matter into energy. At present, nuclear energy is covering 16% of world’s electricity and scientists are working to make a fusion reactor, which will be a perfect source of an immense amount of energy with lesser disadvantages as compared to a fission reactor.

5. Tidal Energy:
 
It is a form of energy, obtained by changing sea level. It only takes energy to change the tides. It is a very reliable form of energy source due to its predictability. Unlike solar or wind energy it does not depend on seasons instead, it purely depends on gravitational energy.

6. Solar Energy:
 
It is the radiant light and heat from the sun serving as a heat source to human from ancient times It is considered as the most available source of energy on earth. There are usually two technologies to utilize this form of energy, passive and active.
Active solar technique includes the use of photovoltaic panels and solar thermal collectors to convert sunlight into other energy forms.
 Passive solar technique includes orienting a building to earth, using materials of favorable thermal mass or light dispersing properties.

7. Wind Energy:
 
Non-uniform distribution of heat due to solar energy in different regions cause pressure difference, winds the blow from an area of high pressure to an area of low pressure. At sea, winds are stronger than on the land surface. Almost 100 billion watts per year of power in the shape of wind energy is available on earth. In wind areas, windmills are used to produce mechanical energy, which may be used in tube wells or flour mills.


Physics: Work and Energy

KPK G11 Physics Chapter 4 (Work and Energy). All the intermediate level students I who are looking for English subject preparation can find a better solution here. This is because here they can find 11th class English study notes.

TopicWork and energy

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Types of energy

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What is work?

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What is energy?

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What does work do?

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How is work related to energy?

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How is energy measured?

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Conclusion

Without a doubt, it is very hard to study English without good preparation. The English examination is the hardest test that every student should appear if he/she intends to enter the highest level.

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