Write advantages and disadvantages of friction. Write remedies to reduce friction.
Write advantages and disadvantages of friction. Write remedies to reduce friction.
Friction is like fire. Sometime it is desirable and necessary, sometime it is undesirable. Because of friction we can walk, we can hold object, write on surface, we can stand. In presence of friction we can transmit motion of wheel via conveyor belt to another wheel. Friction opposes relative motion and dissipates power in form of heat energy. Due to friction there is wear and tear in parts of machines. Due to friction clothes, shoes, tyres of vehicles are warn out.
$(1)$ To reduce kinetic friction in machines lubricants are used.
$(2)$ Between moving parts of machines ball-bearing are used.
$(3)$ A thin cushion of air is maintained between solid surfaces in order to reduce friction which is shown in figure.
Similar Questions
A block of mass $m$ is pressed against a vertical surface by a spring of unstretched length $l$ . If the coefficient of friction between the block and the surface is $\mu $. Choose the correct statement.
A block of mass $m$ is pressed against a vertical surface by a spring of unstretched length $l$ . If the coefficient of friction between the block and the surface is $\mu $. Choose the correct statement.
A man balances himself in a horizontal position by pushing his hands and feet against two parallel walls. His centre of mass lies midway between the walls. The coefficients of friction at the walls are equal. Which of the following is not correct?
A man balances himself in a horizontal position by pushing his hands and feet against two parallel walls. His centre of mass lies midway between the walls. The coefficients of friction at the walls are equal. Which of the following is not correct?
Which one of the following statements is incorrect?
Which one of the following statements is incorrect?
- [NEET 2018]
Two blocks $A$ and $B$ are released from the top of a rough inclined plane so that $A$ slides along the plane and $B$ falls down freely. Which will have higher velocity on reaching the ground ?
Two blocks $A$ and $B$ are released from the top of a rough inclined plane so that $A$ slides along the plane and $B$ falls down freely. Which will have higher velocity on reaching the ground ?
A horizontal force of $10 \,N$ is necessary to just hold a block stationary against a wall. The coefficient of friction between the block and the wall is $0.2$. the weight of the block is ........ $N$
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- [AIEEE 2003]