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PRINCIPLES OF MECHANICS

PUBLISHED BY: SURENDER KUMAR
OCTOBER 25, 2012

   
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PRINCIPLES OF MECHANICS

UNIFORM SPEED

When a body traverses equal distances in equal intervals of time, however small the interval of time may be, it is said to have a uniform speed.

 

 

 

ACCELERATION

It is the rate of increase of velocity. Its units are m/s2. When a physical object falls freely under the influence of the gravitational pull of the Earth, the acceleration with which it falls below is known as the Acceleration of Free Fall or Acceleration due to gravity( 9.8 m/s2).

 

 

 

 

RETARDATION / DECELERATION

It is the rate of decrease of velocity of a particle in motion.

 

 

 

FORCE

Is that which changes or tends to change the state of rest or of uniform motion of a body in a straight line.

 

 

 

RELATIVE VELOCITY

Is the velocity of one body in relation to another body. Supposing a body A moves with a velocity of 10 miles per hour towards the east and another body B moves in the same direction with a velocity of 5 miles/hour, then relative velocity of A with respect to B is 5 miles/hour to the east and that of B with respect to A is 5 miles/hour to the west. Relative velocity produces certain interesting effects. For example, to a man standing still in rain with an umbrella, the rain appears to fall vertically. But if the man were to drive a car in the rain, the rain will appear to fall at a slant.

 

MOMENTUM

Literally means the quantity of motion in a body. Mathematically, Momentum = mass x velocity of the body. Thus force is equivalent to mass x acceleration of the body.



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