Define Rest and Motion With Examples and Related Term in physics

Exact Meaning of Rest and Motion

Mechanics is the general study of the relationship between motion, force, and energy. This subject is divided into three parts: kinematics, dynamics, and statics. The study of Kinematics is concerned with the motion of objects without considering the forces and energies that may be involved.

we should know that there is neither absolute rest nor absolute motion. Rest and motion are relative concepts.

Objects that change position is called in motion, while objects that remain still are called at rest. However, perspective is very important here. An atom,

For example, is always in motion, but when we see an object in the macro world it appears to be at rest. Therefore, motion and rest both depend primarily on the frame of reference of the observer.

In this topic, we will fully discuss rest and motion which will make your concept clearer.

Definition of Rest in Physics

what is rest in physics

Rest: Objects are said to be at rest if their position relative to their surroundings does not change over time.


A body that is not moving at all and is in a state of stillness. Such a body is in a state of rest.

Definition of Motion in Physics

Motion definition and example in physics

Motion: A moving object is one whose position changes as it changes in relation to its surroundings and time.


A body that does not maintain its size in one place and moves is in a state of motion.

Examples and concepts of Rest in Physics

  • If the book is not disturbed, it will not change its position on the table, The book is in a state of rest.
  • There is no change in the position of a bench at rest in a park fixed under a tree.

Consequently, when a body is at rest, it is not changing its position with respect to its surroundings.

Examples of Motion in Physics with Basic Concept

  • The motion of a car occurs when it moves toward, or away from, a tree or lamppost on a roadside.
  • As flying birds change positions in relation to stationary objects such as trees, they are also considered to be in motion.
1Moving Bus
2Rotating Ferris wheel
3A person walking on the Road

Therefore, a body is said to be in motion when its position in reference to the surroundings changes over time.

Relation Between Rest and Motion in Physics

While a body is at rest or moving, it can be at rest or moving simultaneously. When compared to one set of objects, a body can move while at rest when compared to another set of objects. Therefore, motion and rest are relative concepts. Below are some examples to illustrate this concept.

Rest and motion are related terms in physics:

What Is Meant By Speed in Physics

Speed: A moving body’s speed is defined as the distance it covers in a unit of time. There are uniform and nonuniform speeds. The units are meters per second \frac ms

Speed\;=\;\frac{dis\tan ce}{time}

Position-time graphs are commonly used to display speed.

Define Speed in Physics

What is Uniform Motion in Physics?

Uniform Motion: The motion of a body is uniform when it covers the same distance in the same amount of time.

Rest and Motion Related Terms in Physics

What is Non-Uniform Motion in Physics?

Non Uniform Motion: The body moves in an unequal manner in equal intervals of time.

what is the Best Definition of Displacement?

Displacement: Displacement is defined as the shortest distance between the initial and the final positions being the minimum.

Define Velocity in Simple Words By Physics

Velocity: Velocity is the change in displacement in relation to the time of a body. The magnitude and direction of the quantity are both vectors.


Define Uniform velocity in Physics ?

Uniform velocity: As time passes, both the magnitude and direction remain unchanged.

Define Non-Uniform velocity in Physics?

Non-Uniform velocity: If the body moves with non-uniform velocity in a particular direction or changes directions over an equal period of time, it is said to be moving with non-uniform velocity.

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Average velocity = Time displacement / Total Time Taken

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