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A ball of dough Is rolled into a flat chapatti. Name the force exerted to change the shape of the dough.
When a dough ball is pressed with a roller, it becomes chapati due to pressure. Pressure is an effect of force per unit area.
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- Which of the following is not an effect of force?$(a)$ a force can change the speed of a moving object$(b)$ a force can change the direction of a moving object$(c)$ a force can change the composition of a moving object$(d)$ a force can change the shape and size of an object
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- A batsman hits a cricket ball which then rolls on level ground.After covering a short distance, the ball comes to rest. The ball slows to a stop because$(a)$. the batsman did not hit the ball hard enough.$(b)$. velocity is proportional to the force exerted on the ball.$(c)$. there is a force on the ball opposing the motion.$(d)$. there is no unbalanced force on the ball, so the ball would want to come to rest.
- Paheli mixed flour and water and (i) made a dough, (ii) rolled the dough to make a 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.
- When a ball is dropped from a height, its speed increases gradually. Name the force which causes this change in speed.
- What is the special name of frictional force exerted by fluids (like air or water)?
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