MOTION IN 1D For AIIMS BSC Nursing 2026, Check Formula, Differences, Preparation Tips

Physics starts with the study of motion, and one-dimensional motion is the simplest form of movement. In this topic, an object moves only along a straight path, making it easier to understand the relationship between position, time, and speed.

For AIIMS BSc Nursing 2026 aspirants, this chapter is highly important because direct formula-based and conceptual questions are commonly asked. A strong grip on this topic can help students score quickly and confidently in the exam.

What is MOTION IN 1D For AIIMS BSC NURSING 2026?

Motion in one dimension means the movement of an object along a single straight line. The object can move forward or backward, but its path remains straight.

Examples of one-dimensional motion:

• A lift moving upward or downward

• A train moving on a straight track

• A stone falling vertically downward

• A runner moving on a straight road

This chapter is the foundation of kinematics. Once students understand straight-line motion, they can easily move to two-dimensional and projectile motion later. A clear understanding of this topic makes many later chapters easier.

Position, Reference Point and Path Length in Motion in 1D

Before understanding motion, students must know how position is measured. Every object’s location is measured from a fixed reference point called the origin. If the object changes its position with time, it is said to be in motion. If the position does not change, it is at rest.

Important concepts:

• Position may be positive, negative, or zero

• Motion depends on the observer

• Rest and motion are relative concepts

For example, a person sitting inside a moving bus is at rest relative to the bus but in motion relative to the road. These basics are very important for conceptual questions.

Difference Between Displacement and Distance in Motion in 1D

Displacement and distance are two commonly asked terms in exams. Students must know the difference clearly.

Displacement ≤ Distance 

Example: A person walks 5 m forward and returns 5 m back.

• Distance = 10 m

• Displacement = 0 m

This is because the final position becomes the same as the initial position. Students should always remember that displacement depends only on the start and end point.

Difference Between Speed and Velocity in Motion in 1D

Speed and velocity both indicate how fast an object moves, but they are not identical.

Speed= Distance time   Velocity= Distance Time

If a car moves at 20 m/s east, it is velocity because direction is mentioned. If only 20 m/s is written, it is speed. Understanding this difference helps solve MCQs quickly.

Average Speed and Average Velocity Formula in Motion in 1D 

Average speed and average velocity are important concepts used when an object covers distance in a given time. Understanding their formulas helps students solve motion-based numerical questions quickly and accurately.

Average Speed

avg=Total Distance Total Time

Average Velocity

avg=Total Displacement Total Time

Example: If a student walks 10 m forward and comes back 10 m in 20 seconds:

• Distance = 20 m

• Displacement = 0

So:

• Average Speed = 1 m/s

• Average Velocity = 0

This type of question is very common in entrance exams. Practice these concepts regularly.

Instantaneous Speed and Instantaneous Velocity Explained

Sometimes we need the velocity at a particular instant rather than over a time interval. That is called instantaneous velocity.

Example:

• Speed shown on a car speedometer

• Velocity at exactly 5 seconds

=dxdt

This means velocity is the rate of change of displacement with respect to time. It is an important formula for graph and calculus-based understanding. Students should know the concept even if direct differentiation is not asked.

What is Acceleration in Motion in 1D?

Acceleration tells how fast velocity changes with time. If velocity increases, decreases, or changes direction, acceleration exists.

a=dvdt

Unit = m/s²

Types of acceleration:

• Positive acceleration

• Negative acceleration (retardation)

• Zero acceleration

Examples:

• Bike speeding up = positive acceleration

• Applying brakes = negative acceleration

• Constant speed = zero acceleration

Acceleration-based numericals are very common in exams.

Equations of Motion in 1D With Formula

When acceleration is constant, standard equations of motion are used.

v=u+at

s=ut+12at2

v2=u2+2as

Where:

• u = initial velocity

• v = final velocity

• a = acceleration

• t = time

• s = displacement

These formulas are extremely important for MOTION IN 1D For AIIMS BSC NURSING 2026. Students should practice direct substitution questions daily.

Motion in 1D Graphs: Position-Time and Velocity-Time Graph

Graphs in Motion in 1D help students understand the relationship between position, velocity, and time. Learning position-time and velocity-time graphs makes numerical and conceptual questions easier to solve.

Position-Time Graph

Slope gives velocity.

Slope of x-t graph=v

Velocity-Time Graph

Slope gives acceleration. The area under the graph gives displacement.

Acceleration-Time Graph

The area under the graph gives a change in velocity. Graphs are often used in conceptual MCQs. Regular practice can make these questions scoring.

Motion in 1D Important Numerical Example for AIIMS BSC Nursing

A particle starts from rest and accelerates at 2 m/s² for 5 seconds.

Given:

• u = 0

• a = 2

• t = 5

Using:

v=u+at

v = 0 + 2×5 = 10 m/s

Using:

s=ut+12at2

s = 0 + ½×2×25 = 25 m

Final Answer:

• Final velocity = 10 m/s

• Distance covered = 25 m

These direct numericals are common in exams.

Common Mistakes Students Make in Motion in 1D

Many students lose easy marks due to avoidable mistakes.

Common errors:

• Confusing distance with displacement

• Mixing speed and velocity

• Wrong units in answers

• Sign errors in acceleration

• Using wrong motion equation

• Ignoring graph slope meaning

Avoiding these mistakes can improve accuracy immediately. Revision is the best solution.

How to Prepare MOTION IN 1D For AIIMS BSC NURSING 2026

Students can score well by following a smart preparation plan.

Preparation tips:

• Learn all formulas by heart

• Understand every definition clearly

• Solve NCERT numericals

• Practice graph questions

• Attempt MCQs regularly

• Revise weak concepts weekly

This chapter becomes easy with repeated practice. Consistency matters more than long study hours.

Why Motion in 1D is Important for AIIMS BSC NURSING 2026

Motion in 1D is one of the most fundamental Physics chapters. It builds the base for future topics like projectile motion, laws of motion, work-energy, and circular motion.

Students who master this chapter early gain confidence in Physics. Since many questions are formula-based and straightforward, it is considered a high-scoring topic for entrance preparation. Strong basics in this chapter can improve overall Physics performance.

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