VAIBHAV KALVAKOTA
from
THE LEXICON INTERNATIONAL SCHOOL WAGHOLI, PUNE
Subject :NSO Class : Class 8
A man sharpens his knife as shown in the figure. Which of the properties of friction are in use?
(i) Friction helps us to hold objects.
(ii) Friction acts in the opposite direction of motion.
(iii) Friction causes the surfaces in contact to wear away.
(iv) Friction produces heat energy.
A (i) and (ii)
B (i), (iii) and (iv)
C (iii) and (iv)
D All (i), (ii), (iii) and (iv)
Ans 1:
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Ans 2:
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Adhrit
from
CHSV, Chennai
Class : Class 8
It's not asking about which properties occur (which would be all of them), it's asking which are in use. And that's only 1, 2, and 3. So the options are wrong
Ans 3:
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Hprakash09
from
Billabong high Bhopal, Bhopal
Class : Class 7
The answer is correct, as when friction occurs, obviously, all of its properties will occur, even if not all of the properties are required. That's... how friction works.
Ans 4:
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Anirudh
from
Kendriya Vidyalaya Kanjikode, Palakkad
Class : Class 8
All the properties friction are in use. Hence, the correct one option 'D'.
Ans 5:
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Ans 6:
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Arnav Raj Sharma
from
GEMS International School the ultra master mega, Gurgaon
Class : Class 7
The Options Are wrong I guess because only (i),(ii)and(iii) are in use