class 8 queationsceince
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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.
hope it helps you....
*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.
hope it helps you....
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Advantages of friction:
We are able to walk because of friction.
Friction between the tip of the pen and a paper allows us to write.
Disadvantages of friction:
Tyres and soles of shoes wear out because of friction.
Friction between the different parts of machines produces heat. This can damage the machines.
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