TubeSort Extras
You're not Alone!

We're here to help you to fight your YouTube Addiction!

Join TubeSort Today!
TubeSort Extension

Take your get rid of youtube challenge to the next level with our free chrome extension.

Get it now!
Browse Categories
Video Description
βœ”οΈπŸ“šπŸ‘‰ Watch Full Free Course:-​
βœ”οΈπŸ“šπŸ‘‰ Get Notes Here:​
βœ”οΈπŸ“šπŸ‘‰ Get All Subjects playlists:- ​

βœ… In this video,

βœ”οΈ Class: 9
βœ”οΈ Subject: Physics
βœ”οΈ Chapter: Work, Energy and Power
βœ”οΈ Topic Name: NCERT Solutions (Part 1


πŸ“’ πŸ”₯ Available (Kindergarten to 12th) all Video Subject wise Playlist

Why study from Magnet Brains?
Magnet Brains is an online education platform that helps give You NCERT/CBSE curriculum based free full courses from Kindergarten to Class 12th so that you can perform well in any and all exams you give in your academic career.

πŸ‘‰ Contact us πŸ€‘πŸ€‘
➑️ Connect with us :
➑️ Website :
➑️ Subscribe to us on YouTube:
➑️ Facebook :

Points covered in this video:-

NCERT Solutions
Question. 1. Look at the activities listed below. Reason out whether or not work is done in the light of your understanding of the term β€˜work’.
β€’ Suma is swimming in a pond.
β€’ A donkey is carrying a load on its back.
β€’ A windmill is lifting water from a well.
β€’ A green plant is carrying out photosynthesis.
β€’ An engine is pulling a train.
β€’ Food grains are getting dried in the sun.
β€’ A sailboat is moving due to wind energy

- Suma is doing work. This is because Suma is moving herself in water of the swimming pool by applying force.
- A donkey is not doing work against gravity. This is because it is carrying load (weight) at right angles to the force of gravity. A donley, however does work against friction and air resistance.
- A wind mill is doing work. This is because it is lifting up water from the well against the force of gravity.
- A green plant does no work during photosynthesis. This is because in this case both, the force as well as the distance moved are zero.
- An engine does work in pulling a train. This is because an engine applies force due to which the train moves.
- No work is done when food-grains are dried in the sun. this is because no motion takes place in the presence of solar energy.
- Work is done when sailboat moves. This is because wind is applying force which produces motion in the sailboat.