Kinematics and Kinetics
Introduction:
Mechanics
It is a branch of Physics in which we study about the motion and its causes. Mechanics is studied under two parts : Kinematics & Kinetics.
Kinematics
It is a branch of mechanics in which we study about the motion of a body without considering the cause of the motion.
But when we study the motion by considering its cause, then the branch of mechanics is known as kinetics.
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Rest and Motion :
An Object is said to be in rest if it does not change its position with respect to its surrounding with time.
An object is said to be in motion if it changes its position with respect to its surrounding with time.
Rest and Motion are relative terms. It means a body may be in motion with respect to another body and at the same time it may be at rest with respect to any other body.
Ex.-
Two persons have seated under moving training. They both are at rest with respect to each other and also with respect to seats and other persons at the train. But at the same time they are in motion with respect to a tree or any other object outside of the train.
Concept of Point object : Particle or Body
When we study the motion of an object, sometimes the dimension of the object is not Important. For example, if a bus travels a long distance in that case the size of the bus is neglected with respect to the distance travelled. In this case we simply apply the laws of mechanics by considering the bus as a particle.
In Mechanics, a particle is a point mass of negligible dimensions. But in practice, the nearest approach to a particle is a body, whose size is much smaller than the distance or the length measured.
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Physics Class 9 & 11 ( based on new revised syllabus )
1. Physical world
- Units and Measurements, part-1
- Length, mass and time Measurements
- Estimation or Calculation of errors
- Significant Figures and its Rules
- Dimensional Analysis
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