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 body of mass $4\, kg$ is at rest on a horizontal table. The coefficient of friction between the body and the table is $0.2$ . A horizontal force of $6N$ is applied on the body. The acceleration of the body is .......... $m/s^2$
A body of mass $4\, kg$ is at rest on a horizontal table. The coefficient of friction between the body and the table is $0.2$ . A horizontal force of $6N$ is applied on the body. The acceleration of the body is .......... $m/s^2$
$Assertion$ : Angle of repose is equal to the angle of limiting friction.
$Reason$ : When the body is just at the point of motion, the force of friction in this stage is called limiting friction.
$Assertion$ : Angle of repose is equal to the angle of limiting friction.
$Reason$ : When the body is just at the point of motion, the force of friction in this stage is called limiting friction.
- [AIIMS 2008]
A mass of $4\; kg$ rests on a horizontal plane. The plane is gradually inclined until at an angle $\theta= 15^o$ with the horizontal, the mass just begins to slide. What is the coefficient of static friction between the block and the surface ?
A mass of $4\; kg$ rests on a horizontal plane. The plane is gradually inclined until at an angle $\theta= 15^o$ with the horizontal, the mass just begins to slide. What is the coefficient of static friction between the block and the surface ?
Maximum force of friction is called
Maximum force of friction is called
Which of the following statements is not true
Which of the following statements is not true