CBSE Class 9 Physics Wind Power And Energy Worksheet

Read and download free pdf of CBSE Class 9 Physics Wind Power And Energy Worksheet. Students and teachers of Class 9 Physics can get free printable Worksheets for Class 9 Physics in PDF format prepared as per the latest syllabus and examination pattern in your schools. Standard 9 students should practice questions and answers given here for Physics in Grade 9 which will help them to improve your knowledge of all important chapters and its topics. Students should also download free pdf of Class 9 Physics Worksheets prepared by school teachers as per the latest NCERT, CBSE, KVS books and syllabus issued this academic year and solve important problems provided here with solutions on daily basis to get more score in school exams and tests

Wind Power And Energy Class 9 Physics Worksheet Pdf

Class 9 Physics students should refer to the following printable worksheet in Pdf for Wind Power And Energy in standard 9. This test paper with questions and answers for Grade 9 Physics will be very useful for exams and help you to score good marks

Class 9 Physics Worksheet for Wind Power And Energy

CBSE Class 9 Physics Worksheet - Wind, Power And Energy - Practice worksheets for CBSE students. Prepared by teachers of the best CBSE schools in India.

WIND, POWER AND ENERGY

1. Read the activities listed below. Reason out whether or not work is done in the light of your understanding of ‘work’.

(a) Seema is swimming in the pond. (e) An engine is pulling a train.

(b) A donkey is carrying a load on his back. (f) Foodgrains are getting dried in the sun.

(c) A windmill is lifting water from a well (g) A sailboat is moving due to wind energy.

(d) A green part is carrying out photosynthesis.

2. What will happen to the amount of work done if:

(a) The magnitude of the force applied is increased?

(b) The displacement of the body is reduced?

3. From the following activities listed below, state whether or not the work is done. Give reasons also.

(a) An apple is falling off a tree. (f) A man is holding a bucket of water.

(b) A girl is pushing a book on a table. (g) A coolie is lifting a load on his head.

(c) A horse is pulling a cart. (h) A cat is flying due to moving air.

(d) Sunil is reading a book. (i) A man is climbing the stairs.

(e) A man is pushing a wall (j) A ball is thrown upwards in the air.

4. When is the work done by a force on a body said to be positive? Give 2 examples.

5. When is the work done by a force on a body said to be negative? Give 2 examples.

6. State with reason whether the work done in following is positive or negative:

(a) Work done by a man in lifting out of the well a bucket tied by means of a rope.

(b) Work done by gravitational force in the above case ‘a’.

(c) Work done by friction on a body sliding down an inclined plane.

(d) Work done by applied force on a body moving on a rough horizontal plane with uniform velocity.

(e) Work done by resistive force of air on a vibrating pendulum to bring it to rest.

7. Define one-joule energy.

8. Explain

(a) A moving cricket ball can do work. (c) A compressed spring can do work.

(b) A striking hammer can do work.

9. Explain with help of an activity

(a) A moving object possesses energy and can do work.

(b) An object moving faster can do more work than an identical object moving relatively slow.

10. Derive the formula for kinetic energy : KE = 1/2mr2

11. How is the kinetic energy of a moving body affected if its velocity is tripled?

12. What would have a greater effect on kinetic energy of an object – doubling the mass or doubling the velocity?

13. A compressed spring can do work. Explain with the help of an activity.

14. A stretched spring can do work. Explain with help of an activity.

15. What happens to the potential energy of a body if

(a) Its mass is tripled? (d) It is lowered halved to its original height?

(b) Its mass is reduced to one-fourth? (e) The body is taken from the poles to the equator?

(c) It is raised four times the original.

16. Give reasons:

(a) Winding the spring of our watch, the hands of the watch move,

(b) A bullet is released on firing the pistol.

(c) An arrow moves forward when released from the stretched bow.

17. Explain the transformation in the following cases:

(a) Production of hydroelectricity (d) Production of fossil fuel

(b) Production of food by green plants (e) Water cycle in nature.

(c) Running of a windmill

18. What kind of energy transformation takes place in the following gadgets?

(A) Solar cell (b) telephone (c) electromagnet (d) electric heater

Students must free download and practice these worksheets to gain more marks in exams. CBSE Class 9 Physics Worksheet - Wind, Power And Energy