Can you give an example where only one law is most visible?

In one line

A cricket ball falling straight down shows only Newton’s First Law of Motion most clearly.

The rule

An object at rest stays at rest, and an object in motion stays in motion with the same speed and direction unless acted upon by an unbalanced force.

No formula for the first law, but it is the law of inertia (an object's habit of staying as it is).

Let's understand it simply

Imagine you are sitting in a stationary auto. The auto will not move unless the driver starts the engine and presses the accelerator. If the auto is moving, it will keep going at the same speed and in the same direction unless the driver brakes or turns the wheel. This is Newton’s First Law. It tells us that things do not change their motion unless something pushes or pulls them.

Think of a cricket ball lying on the ground. It will stay there unless someone kicks it. If you roll a roti on the kitchen counter, it keeps moving until friction (the rubbing force) slows it down. In both cases, the ball or roti wants to keep doing what it was already doing.

How it works

An object is at rest (not moving).
It will stay at rest unless a force acts on it (like a push or pull).
If the object is moving, it will keep moving in the same direction and speed.
Only an unbalanced force (like friction, a kick, or a wall) can change its state.
If there is no force, nothing changes.

Newton’s First Law in a Bus

Bus is at rest, student is at rest.
Bus starts suddenly, student stays at rest (inertia).
Student appears to move backward as bus moves forward.
A force (friction with floor or holding a handle) is needed to move student with the bus.

The story behind it

Isaac Newton wrote this law in 1687 in England. Before him, people thought things stopped moving because it was their nature. Newton realized that things only stop because of forces like friction or air resistance. His law changed how people understood motion. Newton was inspired by daily life, like apples falling from trees, and wanted to explain why things move or stay still.

Where you see it in real life

A cricket ball at rest on the pitch → It stays still until the bowler throws it → Shows the first law (inertia).
A bus suddenly braking → Passengers lurch forward → Their bodies want to keep moving (inertia).
A cycle coasting on a flat road → It keeps moving until friction or brakes stop it → First law in action.
A Diwali rocket before lighting → It does not move until you light it (apply force).
A book on a table → It stays at rest until you pick it up.
A rolling football on a smooth field → Keeps rolling until grass or a player stops it.

Why it matters

Designing vehicles: Engineers use this law to make cars, buses, and trains safe (seat belts protect you from inertia).
Sports: Players use the law to plan how to stop or start moving quickly.
Daily safety: Understanding why you move forward in a braking bus helps you hold on.
Physics foundation: This law is the base for all motion studies. Later chapters on force, friction, and momentum build on it.

Worked example

Let’s see a simple example:

Given: A 50 kg student is standing in a stationary bus.
Step 1: The bus suddenly starts (applies force to the bus, not to the student).
Step 2: The student tends to stay at rest (inertia).
Step 3: The student feels pushed backward, but actually, the bus moves forward under them.
Step 4: This is Newton’s First Law — the student wants to stay at rest until a force acts.

Common mistakes

Thinking things move forever without force: In real life, friction always slows things down. But the law says, without any force, motion continues.
Confusing the first law with the second: The first law is about staying the same (rest or motion), the second is about how much things speed up or slow down.
Forgetting about direction: The law says speed and direction stay the same unless a force changes them.
Believing only moving things have inertia: Things at rest also have inertia — they resist being moved.