Conservation of Energy
Conservation of Energy
Conservation of Energy
Energy can neither be created nor destroyed. It can only be changed from one form to another.
The above principle is called the principle of conservation of energy. It means that when all forms of energy are taken into account, the total energy in the universe remains constant. The principle is also valid for an isolated, i.e., one on which no force acts from outside.
Examples:
1. When a ball is dropped from a height, its gravitational potential energy decreases, since its height decreases. It may seem that energy has been lost. But the ball gains speed, and hence, it acquires kinetic energy. Actually, as the ball falls its potential energy is gradually converted into kinetic energy.
2. When we switch on an electric torch, the chemical energy stored in the batteries is converted into heat energy as the filament of the bulb gets heated. Heat energy is then converted into light energy.
3. When a person does work on an object, the energy of the object increases. As the total energy is constant, the person must lose the same amount of energy. That is why when we push a heavy box on a surface, we feel tired. We do work on the box, and hence, lose energy.
___________________ can only be changed from one form to another. | |||
| Right Option : D | |||
| View Explanation | |||
The total energy of a swinging pendulum at any instant of time ______________________ | |||
| Right Option : C | |||
| View Explanation | |||
Which of the following are correct : (a) When all forms of energy are taken into account, the total energy in the universe remains constant. (b) Energy can neither be created nor destroyed. It can only be changed from one form to another. (c) The principle of conservation of energy is also valid for an isolated, i.e., one on which no force acts from outside. | |||
| Right Option : D | |||
| View Explanation | |||
Students / Parents Reviews [10]
Abhyas is a complete education Institute. Here extreme care is taken by teacher with the help of regular exam. Extra classes also conducted by the institute, if the student is weak.
Om Umang
10thOne of the best institutes to develope a child interest in studies.Provides SST and English knowledge also unlike other institutes. Teachers are co operative and friendly online tests andPPT develope practical knowledge also.
Aman Kumar Shrivastava
10thIt has a great methodology. Students here can get analysis to their test quickly.We can learn easily through PPTs and the testing methods are good. We know that where we have to practice
Barkha Arora
10thMy experience was very good with Abhyas academy. I am studying here from 6th class and I am satisfied by its results in my life. I improved a lot here ahead of school syllabus.
Ayan Ghosh
8thMy experience with Abhyas is very good. I have learnt many things here like vedic maths and reasoning also. Teachers here first take our doubts and then there are assignments to verify our weak points.
Shivam Rana
7thI have spent a wonderful time in Abhyas academy. It has made my reasoning more apt, English more stronger and Maths an interesting subject for me. It has given me a habbit of self studying
Yatharthi Sharma
10thA marvelous experience with Abhyas. I am glad to share that my ward has achieved more than enough at the Ambala ABHYAS centre. Years have passed on and more and more he has gained. May the centre flourish and develop day by day by the grace of God.
Archit Segal
7thMy experience with Abhyas academy is very good. I did not think that my every subject coming here will be so strong. The main thing is that the online tests had made me learn here more things.
Hiya Gupta
8thIt was good as the experience because as we had come here we had been improved in a such envirnment created here.Extra is taught which is beneficial for future.
Eshan Arora
8thAbhyas Methodology is very good. It is based on according to student and each child manages accordingly to its properly. Methodology has improved the abilities of students to shine them in future.
