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Answers
Answer:
The force of friction pushes it in the forward direction and allows us to walk. The force of friction between the ground and feet decreases when there is soapy water spilled on the floor. Hence, it becomes difficult to walk on the soapy floor.
Friction is the force resisting the relative motion of solid surfaces, fluid layers, and material elements sliding against each other. There are several types of friction: Dry friction is a force that opposes the relative lateral motion of two solid surfaces in contact.
Examples to show that friction is a friend and a foe: Friction is friend: (i) Friction allows us to grip and catch different objects. (ii) It helps us to walk comfortably on the surface. ... Friction is foe: (i) Friction causes wear and tear in objects. (ii) It causes damage to the parts of machines.
Explanation:
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QUESTION (1)
You spill a bucket of soapy water on a marble floor accidentally. Would it make it easier or more difficult for you to walk on the floor? Why?
ANSWER (1)
Soapy marble floor reduces the friction of the surface therefore it becomes more difficult to walk on the soapy marble floor.
This happens because to move forward we need to push the ground in backward direction which become difficult if friction is less.
QUESTION (2)
What is fiction? Give examples to show that fiction is both friend and foe?
ANSWER (2)
Friction is a force that opposes motion between any surfaces that are touching. Friction can work for or against us.
Examples to show that friction is a friend and a foe:
Friction is friend:
(i) Friction allows us to grip and catch different objects.
(ii) It helps us to walk comfortably on the surface.
(iii) It helps to minimize the speed or to stop the moving objects.
(iv) It helps us to write on paper or blackboard.
(v) The things do not move from their places if we do not want to move, due to friction.
Friction is foe:
(i) Friction causes wear and tear in objects.
(ii) It causes damage to the parts of machines.
(iii) The machines or tools regular maintenance due to which a lot of money is wasted.
(iv) It reduces the speed of moving objects so more force is required.
(v) It does not allow the free movement of objects.
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