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Friction General Understanding

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Question

what happens to the shape of a ball of dough when it is rolld to make a chapati?

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Solution

When the ball of dough is rolled, force acts on it. This force tends to change the shape of the dough and gives it a shape of plane sheet which is called chapati. Also if the pressure applied is even on the ball of dough then it spreads evenly in all directions and acquire a circular shape.

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Q. Paheli mixed flour and water and
(i) made a dough,
(ii) rolled the dough to make chapati,
(iii) baked the chapati on a pan,
(iv) dried the chapati and ground it in a grinder to make powder.
Identify the changes (i) to (iv) as the changes that can be reversed or that cannot be reversed.

Q. A ball of dough is rolled into a flat chapatti. Name the force exerted to change the shape of the dough.

What is the difference between the following changes:
(i) Rolling of chapati from dough and (ii) Baking of chapati.

Q. Question 9

A ball of dough is rolled into a flat chapatti. Name the force exerted to change the shape of the dough.

Q. Question 18
A chapati maker is a machine which converts balls of dough into chapatis. What effect of force comes into play in this process?

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