Question

In a sewing machine used by tailors, mention the type of motion of sewing machine parts when it runs
A. The wheel
B. The needle
C. The cloth

Answer 1

Hint: The wheel of a sewing machine is rotated during the working of the sewing machine. The needle goes up and down in a periodic manner when the machine is rotated. The cloth which is being stitched is moved in a particular direction in order to stitch it.

Complete step-by-step answer:
The wheel of a sewing machine is rotated about an axis in order to work the sewing machine. So, the wheel executes a rotational motion about the axis of the sewing machine.
The sewing goes up and down in order to stitch the cloth. We can see that it is moving in a periodic fashion about a certain point at regular intervals of time. So, the motion executed by our sewing needle is a periodic motion.
The cloth which is being stitched is moved across the stitching table. So, the position of the cloth is changing with time. We can call this motion as the translation motion executed by the cloth.

Note: An object is said to be executing translator motion if the position of the object changes with time. An object can follow a linear, circular, curved or an irregular path while executing a translator motion.
An object is said to be executing rotational motion when it rotates about an axis. The axis may or may not pass through the centre of the body. An axis can pass through any point on the body. The particles which lie at a distance of a particular radius vector from the axis have the same angular displacement.
In periodic motion, a body repeats its motion after an interval of time about a certain point in space.
The rolling motion of a body is the combination of rotational as well as translational motion of a body.