Question

A branch of physics dealing with motion without considering its causes is known as A. Statics B. Dynamics C. Kinematics D. Hydrodynamics

Answer 1

Hint:In this question, there are 4 different sub-branches of Physics, that deal with moving bodies and they all, fall under the main branch of Physics known as Mechanics. The answer can be obtained by understanding the definitions of the given branches.

Complete step-by-step answer:
The branch of Physics that deals with the motion of macroscopic bodies is called Mechanics. This branch of Physics has its origin since ancient Greece from the writings of Aristotle and Archimedes. However, the 17^th century scientist by name Sir Isaac Newton laid the foundation of modern mechanics. Therefore, this branch is also referred to as Newtonian Mechanics.
There are several disciplines under the branch of Mechanics. They are: A. Statics
This branch of mechanics deals with bodies at rest. It consists of analysis of the body such as application of loads on bodies with zero acceleration. This branch is mainly used to calculate loadings in physical and stationary structures like that of buildings, dams, bridges etc.
B. Dynamics
This branch of mechanics deals with moving bodies with finite acceleration. It takes into consideration the cause of the motion, which is the force. As per Newton’s law of force,
$F = ma$
which means that, as long as acceleration exists, there is force applied. This branch of study takes into consideration the force.
C. Kinematics
This branch of mechanics deals with moving bodies without taking into account the cause of the motion. The core of the kinematics deals only with the velocity and acceleration of the bodies without studying about its origin. Here, there is more emphasis on the relationships among the displacement, velocity and acceleration. The center of focus of this branch is the set of 3 Newton’s laws of motion.
As per the given question, the branch that deals with motion without considering the causes, is kinematics.
Hence, the correct option is Option C.

Note:The branch hydrodynamics deals with the forces acting on fluids, when the fluid is in motion. It is centered on concepts such as pressure difference, Bernoulli’s theorem etc. The other three branches mentioned in the question correspond to rigid bodies while hydrodynamics is about fluids.