🍎 Who Was Isaac Newton?
Sir Isaac Newton was a famous scientist who lived over 300 years ago. He discovered three rules — called the Laws of Motion — that explain how everything moves. This is the first of those three important laws!
The First Law
📜 Newton's First Law:
An object at rest stays at rest, and an object in motion stays in motion — unless a force acts on it.
In simple words: things keep doing what they're already doing until something pushes or pulls them to change. This idea is called inertia.
What is Inertia?
Inertia is the tendency of objects to resist changes in their motion. Heavy objects have more inertia than light ones, so they are harder to start moving and harder to stop!
💡 In the Car:
When a car suddenly stops, your body keeps moving forward — that's why we wear seatbelts! Your body wanted to stay in motion because of inertia. The seatbelt provides the force that safely stops you.
📝 Everyday Examples:
- A ball sitting on the grass won't move until you kick it ⚽
- A magician pulls a tablecloth and the dishes stay put 🍽️
- You slide forward on your bike when you brake hard 🚲
- A hockey puck glides across the ice until friction slows it 🏒
What Changes Motion?
An object only changes its motion when a force acts on it. A force is a push or a pull. Some common forces that change motion are:
- Friction — slows sliding objects down
- Gravity — pulls things toward the ground
- A push or a kick — gets things moving
- Air resistance — slows down things moving through the air
📚 Quick Summary
1️⃣ First Law
Objects keep doing what they're doing unless a force acts
💡 Inertia
The resistance of objects to changing their motion
⚖️ More Mass
Heavier objects have more inertia
🛑 Forces
A push or pull is needed to change motion
➡️ Keep Exploring
2️⃣ Newton's Second Law
Discover how force, mass, and acceleration connect with F = m × a.