West Bengal Board Solutions for Chapter: Time and Motion, Exercise 9: Exercise 9

Author:West Bengal Board

West Bengal Board Science Solutions for Exercise - West Bengal Board Solutions for Chapter: Time and Motion, Exercise 9: Exercise 9

Attempt the practice questions on Chapter 2: Time and Motion, Exercise 9: Exercise 9 with hints and solutions to strengthen your understanding. Environment and Science Class 7 solutions are prepared by Experienced Embibe Experts.

Questions from West Bengal Board Solutions for Chapter: Time and Motion, Exercise 9: Exercise 9 with Hints & Solutions

EASY
7th West Bengal Board
IMPORTANT
Environment and Science Class 7>Chapter 2 - Time and Motion>Exercise 9>Q 4

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Take spring and pull it at both ends.
What is happening?
Does the spring move from one place to another? Or does it only change its shape?
Have you done any work?

EASY
7th West Bengal Board
IMPORTANT
Environment and Science Class 7>Chapter 2 - Time and Motion>Exercise 9>Q 5

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Take a hand pump and attach a balloon at its nozzle as shown in the figure. Push the piston towards the balloon.
What do you see? Is the hand pump displaced as a whole?
Why is the balloon inflated?
On which body is your force applied?
Has the force applied by you done any work?

EASY
7th West Bengal Board
IMPORTANT
Environment and Science Class 7>Chapter 2 - Time and Motion>Exercise 9>Q 6

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Sit on a chair and take a deep breath.
Do you feel anything?
Does your chest expand or contract?
Who is applying the force for expansion or contraction of the chest and where?
Does the force do any work?

EASY
7th West Bengal Board
IMPORTANT
Environment and Science Class 7>Chapter 2 - Time and Motion>Exercise 9>Q 7

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Push a wall for a long time. Are you able to displace the wall along the direction of your applied force?
Is there any change in the shape and volume of the wall?
Do you feel tired?
Does your heartbeat increase while pushing the wall?
Does the rate of your respiration increase during that period?
Does any part of your body gets heated up?