Dimensions & Motion

Dimension: Dimension is the measurement of an objects regards with its mass, length and time.

It is also defined as the coordinates which can define the size of object.

Dimensional Formula: Dimensional formula gives the powers of mass ,length and time which are raised to attain the unit of any physical quantity.

Here I am describing dimensional formulas of few common and important physical quantities which are used in general terms.

Rest:An object is said to be at rest when it remains in the same position . When the object does not changes its position it is called to be at rest.

Example: Stone on the hill

Motion:An object is said to be in motion when it covers some distance or when an object changes its postion with time it is called in motion.

Example:moving car, Running ball.

 

Types of motion:

One Dimensional Motion:When an object moves in one direction only or when in the x-axis .The motion is said to be one dimensional. Example: running train

Two Dimensional Motion: When an object moves in two directions or we can say that when an object moves in x-axis and in y-axis simultaneously it said to be two dimensional motion.

Example:Crawling insect.

Three Dimensional Motion: When an object moves in three axis or in space it is called three dimensional motion.

Example: Motion of aeroplane.

 

Uniform Motion: When an object moves equal distances in equal intervals of time it is called uniform motion . For example: Take an object which covers 5 meters in 10 seconds . Then in next 5 seconds it again covers 5 meters of distance then again n again .This is called uniform motion.

Non Uniform Motion: When an object covers equal distance in unequal interval of time or unequal distance in equal intervals of time .It is called non-uniform motion.For example: Take an object which covers 10 meters in 7 seconds and next 10 meters in 12 seconds .this is non uniform motion.

 

Velocity: Velocity is the ratio of displacement with time or it is also defined as the rate of change of displacement is called velocity

 

Velocity=Displacement/Time

 

Displacement is same as the distance but the difference is that displacement is the shortect distance in a particular direction.


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