Pushkar Sonnekar
from
Ryan International School, Mumbai, Vasai East
Subject :NSO Class : Class 8
Identify the methods of increasing and decreasing friction and choose the correct option.
(i) The tyres of vehicles have treads.
(ii) Gymnasts often apply a coarse material on their hands.
(iii) Saliva in our mouth helps us to swallow food.
(iv) A surgeon powders his hand before pulling on his plastic gloves
(i) | (ii) | (iii) | (iv) | |
A | Increasing | Decreasing | Increasing | Decreasing |
B | Decreasing | Increasing | Decreasing | Increasing |
C | Increasing | Increasing | Decreasing | Decreasing |
D | Decreasing | Decreasing | Increasing | Increasing |
Can anybody explain in option C. why would a gymnast apply powder to their hands to increase the friction?
Ans 2:
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Ashmi Narkar
from
The Shishukunj International School, Jhalaria Campus, Indore
Class : Class 9
option a
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Ans 5:
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Ans 8:
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Aayushman mohapatra
from
Sental The Global School, Hyderabad
Class : Class 8
Please correct it SOF olympiad trainer