MECHANICS STORY-PART(1)
SO now why mechanics stood first in the line of syllabi???
- First of all, The only visible view of Physics seen through scientific eyes is the moving of objects infact motion in nature increase the Curiosity of humans in this field of physics.
- Second, As its only branch which accumulated with all other branches of physics and its vast use and has only reason that it becomes difficult for most of us.
Further, it is divided into three parts:-
(i)Statics-It is a branch of mechanics which deals with the study of the material object at rest.
(ii)Dynamics-It is that branch of mechanics which deals with the study of the motion of objects taking into the account the factors which cause motion.
(iii)Kinematics-It is that branch of mechanics which deals with the study of the motion of objects without taking into account the factors which cause motion.
OBJECT IN MOTION:-
(i)Rest- An object is said to be at rest if it does not change its position with time, with respect to its surroundings.zero change in coordinates.
(ii)Motion- An object is said to be in motion if it changes its position with time, with respect to its surroundings.There is a constant or variable change in the coordinates.
Rest and Motion are Relative.It means an object in one situation can be at rest but in another situation, the same object can be in motion.For Example, a person A standing on bus stand see a person B sitting in a moving bus and consider a third person C sitting in the same bus as of the person A.Now, person B is in rest with respect to person C but is in rest with respect to person A.
TYPES OF MOTION:-
Mainly the motion of a body can be of following three types:
A Translatory Motion-is that motion in which a body, which is not a point source body is moving such that all its constituent particles move simultaneously along parallel straight lines and all its constituent particles shift through an equal distance in a given interval of time.
(ii)ACircular Motion is that motion in which a particle or a point mass body is moving in a circle.
A Rotatory Motion is that motion in which a body, which is not a point mass body, is moving such that all its constituent particles move simultaneously along concentric circles, whose centres lie on a line, called the axis of rotation and shift through the equal angle in a given line.
(iii) Oscillatory motion is that motion in which a body moves to and fro or back and forth repeatedly about a fixed point(called mean position) in a definite interval of time.
if in the oscillatory motion, the amplitude is very small or microscopic, the motion is said to be a vibratory motion.
The concept of Point Mass Object-An Object can be considered as a point object if, during motion at a given time, it covers distances much greater than its own size.
Point Object it just an imaginational and mathematical concept of negligible mass and of zero radii.
Frame of reference-It just a viewing position of the observer with an account to the mathematical coordinates.
a)Inertial Frame of Reference- is one who follows Newton's First Law of Motion.
b)Non-Inertial Frame of Reference-is one who doesn't follow Newton's First law Motion.
Scalar Quantity-Its a Quantity only having magnitude but no direction.
Vector Quantity- Its a Quantity having both magnitude and direction.
Distance-Actual PATH TAKEN.(it has the only direction)
Displacement-Shortest PATH TAKEN.(It has direction and magnitude both)
VELOCITY AND SPEED
SPEED-Its generally of an object is defined as the ratio of the total path or distance length (i.e. actual length divided by the corresponding time.
VELOCITY-of an object in a motion is defined as the ratio of displacement divided by the corresponding time interval taken by the object.
In imaginational view if we considers snake or centipede moving its appear to be fast but in actual if concentrate we get to come to know about that in reality what snake achieve is less velocity as snake appearing to be fast but interestingly cover much less path due to fact that the of sinusoidal path that is motion represented by snake in this type distance covered is much greater than the displacement and this will result in greater speed than velocity .
so what our eyes see is speed but in actual whats happening is velocity.
Mathematical Derivation of Velocity-
Relative Velocity- In this everything world, nothing is there which it doesn't measure relative to any other value even all thing if measure length we measure length with respective to metres.standard for metres is used as one thing which doesn't change with physical or natural properties is kept as constant at a secure place.
The relative velocity of one object w.r.t. another is the velocity with which one object moves w.r.t. another object.
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