Frank Modern Certificate Solution for Class 10 Physics Chapter Unit - 1 - Force, Work, Energy and Power- (Different Forms, Sources, Conservation and Transformation of Energy)
Frank Textbook Solutions Chapter Unit - 1 - Force, Work, Energy and Power- (Different Forms, Sources, Conservation and Transformation of Energy)
Frank Textbook Solutions are considered extremely helpful for solving difficult questions in the ICSE Class 10 Physics exam. TopperLearning Textbook Solutions are compiled by our subject experts. Herein, you can find all the answers to the questions of Chapter Unit - 1 - Force, Work, Energy and Power- (Different Forms, Sources, Conservation and Transformation of Energy) for the Frank textbook.
Frank Textbook Solutions for class 10 are in accordance with the latest ICSE syllabus, and they are amended from time to time to be most relevant. Our free Frank Textbook Solutions for ICSE Class 10 Physics will give you deeper insight on the chapters and will help you to score more marks in the final examination. ICSE Class 10 students can refer to our solutions while doing their homework and while preparing for the exam.
Frank Modern Certificate Solution for Class 10 Physics Chapter Unit - 1 - Force, Work, Energy and Power- (Different Forms, Sources, Conservation and Transformation of Energy) Page/Excercise 68
The energy possessed by a body by virtue of its motion is called kinetic energy.
Examples of kinetic energy:
(i) Air in motion has kinetic energy.
(ii) A swinging pendulum
SI unit of energy is 'joule'.
'Energy' is the body's ability to do work.
Energy is a scalar quantity.
Kinetic energy of a body depends upon:
(i) Mass of the body
(ii) Speed of the body
Yes, if the body is not in motion; it has zero kinetic energy
A moving bullet possesses kinetic energy
Flowing water possesses kinetic energy.
The car should be moving faster because the mass of the car is less than that of the bus.
Its kinetic energy changes with the change in velocity.
Velocity becomes zero at the highest point.
The parameters that can change the kinetic energy are:
A ball at lying at rest on the floor possesses zero kinetic energy.
The energy possessed by a body by virtue of its position, shape or change of configuration is called potential energy.
Potential energy of a body depends upon:
(i) Mass of the body
(ii) Acceleration due to gravity
(iii) Height of the body
SI unit of energy is 'joules'.
Examples of potential energy:
(i) Water stored at a height in a reservoir.
(ii) A stretched spring.
P.E of a body lying on a floor is zero.
The energy spent by the heart in pumping blood through the body is 1 J per beat.
The work done in winding a clock spring is stored as P.E. in the spring. This P.E. is then used to run the hands of the clock.
P.E. of a body of mass M and at a height H above the earth's surface is:
P.E. = MgH ; here, g = acceleration due to gravity.
P.E. is a scalar quantity.
(i) Potential energy
(ii) Heat energy
(iii) Potential energy
(i) At the height H because the height is maximum.
(ii) At the ground level because the velocity is maximum.
(iii) At half distance of the total path i.e. at height H/2, the P.E. is equal to the K.E.
(a) As the height above the ground increases, the potential energy also increases.
(b) At the highest point, the height of the cricket ball is maximum and hence the potential energy is also maximum.
P.E. is the energy possessed by a body by virtue of its position, shape or configuration but K.E. is the energy possessed by a body by virtue of its velocity or motion.
E.g. A ball kept on a cliff possesses P.E. but as soon as it is kicked it possesses K.E.
Whenever one form of energy dissipates or disappears, another form of equivalent amount of energy is produced; this is referred to as transformation of energy.
E.g. when a particular switch is pressed electric lamps light up owing to the heat produced in the filament. This is the transformation of electrical energy to heat and light energy.
Frank Modern Certificate Solution for Class 10 Physics Chapter Unit - 1 - Force, Work, Energy and Power- (Different Forms, Sources, Conservation and Transformation of Energy) Page/Excercise 69
No, total energy of a body does not remain constant but the total energy of a closed system remains constant e.g. universe.
Energy is a scalar quantity.
No, we cannot destroy energy associated with a body.
Energy is the capacity or ability of a body to do work or energy is stored work.
The law of conservation of energy states that energy cannot be created or destroyed; the sum total of energy in a closed system remains unchanged. Energy only changes from one form to another.
Potential energy of water stored at a height in dams get converted into the kinetic energy of the flowing water which is used by a turbine.
Two uses of solar cells:
(i) Solar cells are used as energy sources in calculators.
(ii) Solar panels made up of solar cells are used for the purpose of street lights.
The renewable sources of energy are those sources of energy which can be used again and again. E.g. sun, hydro-energy.
The non renewable sources of energy are those sources of energy, which once exhausted are not easily available again. E.g. coal, petroleum products.
Sun is the most abundant source of energy on the earth.
Solar energy is obtained from the sun.
A dry cell converts chemical energy into electrical energy.
A D.C. motor converts electrical energy into mechanical energy.
A dynamo converts mechanical energy into electrical energy.
Four different forms of energy:
(i) Solar energy
(ii) Mechanical energy
(iii) Wind energy
(iv) Nuclear energy
At a thermal power station, nuclear energy is converted into electrical energy.
(i) Electrical energy to sound energy
(ii) Mechanical energy into heat energy.
(iii) Potential energy into kinetic energy and vice-versa.
(iv) Chemical energy obtained from food is converted into mechanical energy and heat energy in muscles.
(v) A dynamo converts mechanical energy into electrical energy.
The rate of doing work is called power.
'Watt' is the SI unit of power.
Horse power is the unit of power. The horsepower used for electrical machines is defined as exactly 746 watt.
Classically, a horse exerting 1 H.P. can raise 330 pounds of coal 100 feet in a minutes, or 33 pounds of coal 1,000 feet in one minute, or, 1,000 pounds 33 feet in one minute.
If 1 joule of work is done in 1 second, the power is said to be 1 watt.
1 H.P. = 746 watt
Power is the physical quantity associated with the 'rate of doing work'.
Practical or commercial unit of power is kilowatt-hour.
When we wind a watch, the configuration of its spring is changed. The energy stored in the spring is obviously potential in nature (elastic potential to be more accurate).
This heat energy comes from the mechanical energy.
When we rub our hands, mechanical energy is converted into heat energy.
When the head of a nail is struck with a hammer, the mechanical energy of the hammer pushes the nail into the plank of wood and in this process a part of energy is converted into heat energy.
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