Question

An object is said to be at __________ (rest/motion), if it changes in its position with respect to its surroundings in a given time.

Answer 1

Recall that when an object changes its position with time then it is said to be in motion. The type of motion of an object depends on the type of force that is acting on the body. The motion of an object can be explained in terms of speed, velocity, time, distance and acceleration.

Complete solution:
Therefore, an object is said to be in motion, if it changes its position with respect to its surroundings in a given time.
There can be different types of motion depending on the type of force acting as already told. Some of them are:
Linear motion – A type of motion in which the body moves in a straight line only in one dimension.
Rotational Motion – A type of motion in which the object moves along a circular path around a fixed axis.
Periodic motion – A type of motion which repeats itself after certain intervals of time.
Translational Motion – A type of motion in which the object moves in any of the three dimensions following a path.
Projectile Motion – A type of motion that has a horizontal as well as vertical displacement.

Note: It is important to remember that while studying the motion of an object, Newton’s laws of motion are used. This is because Newton’s laws of motion explains how the objects will move or remain still, when force acts on them. There are three laws of motion proposed by Newton that are used.