Motion : An object or a body is said to be in motion if it changes its position with passage of time.
Example : Air , flying birds , flying aircrafts , animals running in a field , moving vehicles , motion of earth around the sun and around it own axis.
Motion of an object along a straight line called Rectilinear motion
Mechanics : The branch of physics which deals with the study of the motion of the objects and the equilibrium of the object under many forces is known as mechanics.S
Statics : The branch of mechanics which deals with the study of the objects or bodies in equilibrium under the action of external forces.
Kinematics: The branch of mechanics which deals with the study of the mechanical motion of bodies without taking into the account of the forces which cause the motion of the bodies.
Dynamics : The branch of mechanics which deals with the study of the mechanical motion of bodies by taking into the account of the forces which cause the motion of the bodies.