1. It helps us in walking and running. When we walk, there is friction between our foot (or of our shoe) and the ground. This prevents you from slipping. If you try to walk on wet floor, you tend to slip because the water reduces the friction between your foot and the floor.
2. It helps us in writing and making drawings. If there were no friction, we would not be able to hold a pen vertically. It is friction that opposes slipping and helps us to hold the pen. Also there is friction between our pen and the paper which prevents the pen from slipping on the paper.
3. Tyres of vehicles are made with special kinds of grooves so that they can move properly on the road. These grooves help to have considerable friction and good grip between the tyres and the road. When a tyre gets old, its surface becomes smooth. Vehicles with worn-out tyres stop after covering a longer distance (when brakes are applied) and hence, there is a greater risk of accident.
4. The force of friction helps to hold the nails and screws on the walls and in the wood.
It is difficult to walk on smooth surface because of ___________________________. | |||
Right Option : B | |||
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Which one of the following activities will produce least amount of frictional force ? | |||
Right Option : C | |||
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Which of the following are correct ? (a) The force of friction helps to hold the nails and screws on the walls and in the wood. (b) Friction produces energy . (c) Friction helps us to do small jobs like opening the lid of a bottle or the top of a pen. | |||
Right Option : C | |||
View Explanation |
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