Question

A moving carrom board coin describes a _____ motion.
A) rectilinear
B) rotatory
C) periodic
D) oscillatory

Answer 1

Hint:The system has one degree of freedom such that only one coordinate is sufficient to analyse the motion. Some examples of rectilinear motion are the movement of a train along a straight railway track, a car’s motion along a straight street, ideal free fall under gravity, the motion of a body suspended to a spring, a lift’s vertical motion etc.

Complete step by step answer:
A coin in the carrom board moves in a straight line between two adjacent collisions, therefore, the motion of the carrom coin describes a rectilinear motion.

Therefore, the correct option is A.

Additional information:If the position of an object changes with respect to time and its surroundings, the body is said to be in motion. Mathematically, motion can be described with displacement, velocity and acceleration in a particular frame of reference. The motion of a particle can be classified on the basis of its trajectory, the simplest being motion along a straight line namely rectilinear motion. The displacement, velocity and acceleration vectors are restricted to one dimension. Rectilinear motion has three types: uniform motion (zero acceleration), uniformly accelerated motion (non-zero constant acceleration) and motion with non-uniform acceleration. Examples of rectilinear motion are free-fall under gravity and simple harmonic motion of a mass attached to a spring.

Note:If a particle is restricted to move along a straight line, its motion is called rectilinear (or linear) motion. Such a motion can be described using one coordinate only. Displacement of the particle and its derivatives i.e. velocity and acceleration all are one-dimensional vectors. Free-fall under the Earth’s gravitational field, a car moving along a straight path can be approximated as rectilinear motions.