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
Ans 3:
Class : Class 9
c
Ans 4:
Class : Class 8
c
Ans 5:
Class : Class 8
option a
Ans 6:
Class : Class 8
Either a) or b)Definitely not c) or d)
Ans 7:
Class : Class 8
It is option a