Least amount of friction is required in which of the following sports?

Rubbing of hands

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Rubbing of glass

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Rubbing of sand paper

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Rubbing of woollen clothes

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Solution

The correct option is C
Rubbing of sand paper

Except for ice skating, in all the other sports friction required is more. For slowing down of vehicles or football or to hold the rope in a tug of war, more friction is required. But in ice skating, the friction should be low to allow easy sliding of the skates.

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Similar questions

Q. Which of the following will produce the maximum friction?
(a) rubbing of sand paper on glazed paper
(b) rubbing of sand paper on glass table top
(c) rubbing of sand paper on aluminium frame
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Rubbing of hands is what type of friction?

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" $\begin{matrix} O b j e c t s r u b b e d & M a t e r i a l u s e d f o r r u b b i n g & A t t r a c t s / d o e s n o t a t t r a c t p i e c e s o f p a p e r & C h a r g e d / n o t c h a r g e d R e f i l l & p o l y t h e n e, w o o l l e n c l o t h B a l l o o n & p o l y t h e n e, w o o l l e n c l o t h, d r y h a i r E r a s e r & w o o l S t e e l s p o o n & p o l y t h e n e, w o o l e n c l o t h \end{matrix}$ "

A glass rod is rubbed with a silk cloth and an inflated rubber balloon is rubbed with a woollen cloth.

Now, out of glass rod, silk cloth, rubber balloon and woollen cloth:

(a) Which two objects acquire negative charge?

(b) Which two objects acquire positive charge?

Q. Magnesium ribbon is rubbed with sand paper before burning it. The reason of rubbing the ribbon is to:

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