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 circular racetrack of radius $300\; m$ is banked at an angle of $15^o$. If the coefficient of friction between the wheels of a race-car and the road is $0.2$, what is the
$(a)$ optimum speed of the racecar to avoid wear and tear on its tyres, and
$(b)$ maximum permissible speed to avoid slipping ?
A circular racetrack of radius $300\; m$ is banked at an angle of $15^o$. If the coefficient of friction between the wheels of a race-car and the road is $0.2$, what is the
$(a)$ optimum speed of the racecar to avoid wear and tear on its tyres, and
$(b)$ maximum permissible speed to avoid slipping ?
A cylinder of mass $10\,kg$ is sliding on a plane with an initial velocity of $10\,m/s$. If coefficient of friction between surface and cylinder is $ 0.5$, then before stopping it will describe ............. $\mathrm{m}$
A cylinder of mass $10\,kg$ is sliding on a plane with an initial velocity of $10\,m/s$. If coefficient of friction between surface and cylinder is $ 0.5$, then before stopping it will describe ............. $\mathrm{m}$
The limiting value of static friction between two contact surfaces is ...........
The limiting value of static friction between two contact surfaces is ...........
A uniform chain of $6\, m$ length is placed on a table such that a part of its length is hanging over the edge of the table. The system is at rest. The co-efficient of static friction between the chain and the surface of the table is $0.5$, the maximum length of the chain hanging from the table is.......$m.$
A uniform chain of $6\, m$ length is placed on a table such that a part of its length is hanging over the edge of the table. The system is at rest. The co-efficient of static friction between the chain and the surface of the table is $0.5$, the maximum length of the chain hanging from the table is.......$m.$
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A body of weight $50 \,N$ placed on a horizontal surface is just moved by a force of $28.2\, N$. The frictional force and the normal reaction are
A body of weight $50 \,N$ placed on a horizontal surface is just moved by a force of $28.2\, N$. The frictional force and the normal reaction are