National Science Olympiad Forum By SOF Olympiad Trainer - Page 97

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Subject :NSO    Class : Class 9

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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 1:

Class : Class 8

Ans 2:

Class : Class 8
Either a) or b)Definitely not c) or d)

Ans 3:

Class : Class 8
It is option a

Ans 4:

Class : Class 8
c

Ans 5:

Class : Class 8
option a

Ans 6:

Class : Class 8

Ans 7:

Class : Class 8
c

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Subject :NSO    Class : Class 7

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Subject :NSO    Class : Class 4

Ans 1:

Class : Class 4
D Rubber

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Subject :NSO    Class : Class 3

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Subject :NSO    Class : Class 5

Ans 1:

Class : Class 5
It is actually c since pitcher plants need some nutrients not present in soil like phosphorus which they get from insects.

Ans 2:

Class : Class 6
d

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Subject :NSO    Class : Class 8

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Subject :NSO    Class : Class 3

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Subject :NSO    Class : Class 3

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Subject :NSO    Class : Class 3

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