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No. 7. is... Fluid friction can be minimised by giving suitable shapes to the objects moving through the fluid.
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Explanation:
NO.7
fluid friction can be minimised by giving suitable shape to objects moving through the fluid
THIS IS TRUE !!
becouse streamlined body shapes moves through fluid with minimum fluid friction, thats why every ships , and many fishes has streamlined shape body !
DrishtiAgarwal:
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no.1 is true
no.2 is false because if car move Eastward then force of friction will act to opposite the movement that mean
force of friction will act west ward
no.3 true
no.4 false .to increase the friction
no.5 true
no.6 false friction will be decrease by using ball bearing.
no.7true
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