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 $15 \;kg$ is placed on a long trolley. The coefficient of static friction between the block and the trolley is $0.18$. The trolley accelerates from rest with $0.5 \;m s ^{-2}$ for $20 \;s$ and then moves with uniform velocity. Discuss the motion of the block as vlewed by
$(a)$ a stationary observer on the ground,
$(b)$ an observer moving with the trolley.
A block of mass $15 \;kg$ is placed on a long trolley. The coefficient of static friction between the block and the trolley is $0.18$. The trolley accelerates from rest with $0.5 \;m s ^{-2}$ for $20 \;s$ and then moves with uniform velocity. Discuss the motion of the block as vlewed by
$(a)$ a stationary observer on the ground,
$(b)$ an observer moving with the trolley.
A block of weight $W$ is kept on a rough horizontal surface (friction coefficient $\mu$). Two forces $W/2$ each are applied as shown in the figure. Choose the $CORRECT$ statement :-
A block of weight $W$ is kept on a rough horizontal surface (friction coefficient $\mu$). Two forces $W/2$ each are applied as shown in the figure. Choose the $CORRECT$ statement :-
Which one of the following is not used to reduce friction
Which one of the following is not used to reduce friction
A stone weighing $1$ kg and sliding on ice with a velocity of $2$ m/s is stopped by friction in $10$ sec. The force of friction (assuming it to be constant) will be ......... $N$
A stone weighing $1$ kg and sliding on ice with a velocity of $2$ m/s is stopped by friction in $10$ sec. The force of friction (assuming it to be constant) will be ......... $N$
A heavy body of mass $25\, kg$ is to be dragged along a horizontal plane $\left( {\mu = \frac{1}{{\sqrt 3 }}} \right).$ The least force required is ........ $kgf$
A heavy body of mass $25\, kg$ is to be dragged along a horizontal plane $\left( {\mu = \frac{1}{{\sqrt 3 }}} \right).$ The least force required is ........ $kgf$