1.

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

A. (i) (ii) (iii) (iv)  Increasing Decreasing Increasing Decreasing    
B. (i) (ii) (iii) (iv)  Decreasing Increasing Decreasing Increasing    
C.  \[8h/9\] metres from the ground  
D. (i) (ii) (iii) (iv)  Decreasing Decreasing Increasing Increasing
Answer» D. (i) (ii) (iii) (iv)  Decreasing Decreasing Increasing Increasing


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