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# Tag Archives: Stop-Motion

## Vibratory motion and periodic motion

Say True or false

Every motion made by a vibratory object and then back to its start point is a periodic motion
Note:
In this question its not mentioned that the motion is made in equal intervals of time. Please answer the question and justify it ?!

Posted by Khaled

Vibratory motion caused by a restoring force acting on it when disturbed from mean position and inertia is essentially periodic.

Without a restoring force, the to an fro motion may not be periodic.

## Understanding Projectile Motion

IN A PROJECTILE MOTION WE TAKE MOTION IN A HORIZONTAL DIRECTION AS g=0 while in vertical motion as g=-9.8 meter / second square why?

Projectile Motion is an example for motion in two dimension. It can be studied easily by resolving into two components – The vertical motion is affected by gravity and the horizontal motion is not affected by gravity.

Therefore we take g=0 when we consider the horizontal component of motion as the projectile is not accelerated in the horizontal direction. The horizontal component of velocity remains constant through out its motion.