wunder beta

🚀 Newton's Laws of Motion

Meet the three simple laws that explain how everything moves, from a seatbelt to a rocket, discovered by Isaac Newton.

lessons

~20 min

to learn

🔬 Science

subject

Teens

level

Start the course →

What you’ll learn

First Law: InertiaState Newton's first law and explain inertia with everyday examples.Newton's first law says an object stays at rest, or keeps moving at a steady speed in a straight line, unless a resultant force acts on it. This tendency to resist a change in motion is called inertia, and it explains why seatbelts are needed to stop a passenger when a car halts suddenly.
Second Law: F = maUse Newton's second law, F = ma, to relate force, mass, and acceleration.Newton's second law states that force equals mass times acceleration (F = ma). A bigger force produces a bigger acceleration, while a greater mass reduces the acceleration for the same force. This is why an empty trolley or a light football accelerates far more easily than a loaded trolley or a heavy bowling ball.
Third Law: Action and ReactionState Newton's third law and identify action-reaction force pairs.Newton's third law says that for every action there is an equal and opposite reaction, so forces always act in pairs on different objects. A swimmer pushes water back and is pushed forward, and a rocket pushes exhaust gas down and is pushed up. Recognising which of the three laws explains an example is the real test of understanding.

Questions this course answers

According to Newton's first law, an object at rest will...

The first law says objects keep doing what they are doing, so one at rest stays at rest until a resultant force acts.

Why does a seatbelt protect you when a car stops suddenly?

Inertia keeps your body moving forward when the car stops, and the seatbelt provides the force to stop you safely.

What does Newton's second law state?

The second law is F = ma: the resultant force equals mass multiplied by acceleration.

Why is a heavily loaded trolley harder to accelerate than an empty one?

A greater mass means the same force produces a smaller acceleration, following F = ma.

You push a football and a bowling ball with the same force. Which accelerates more?

The lighter football has less mass, so the same force gives it a greater acceleration.

What does Newton's third law say about forces?

The third law states that forces come in equal and opposite pairs acting on different objects.

Grounded in trusted sources

BBC Bitesize
NASA
The Physics Classroom
Britannica

Every Wunder lesson is built from real, reputable sources — never invented.

Related Science courses

⚖️Newton's Second Law 🗣️Force and Motion Words 🥗Nutrients and a Balanced Diet 🪟Objects and the Materials They're Made Of 🐢Ocean Animal Migrations 🐙Ocean Animals and Their Adaptations 🔄Ocean Currents and Global Heat 🪸Ocean Ecosystems

Wunder is a personalized learn-anything platform — tell it any topic and it builds a beautiful, fact-checked course in minutes, with narration, a knowledge check, and a college-style University track.

Browse more Science courses · All topics · Home