Turning points in physics

What you'll learn

1. 1

   Imagine a game of billiards 🎱 — you hit one ball, it hits another, and the second one moves. That's basically how Newton's laws work!

2. 2

   According to Newton's first law, what happens to a moving ball if no force acts on it?

3. 3

   Let's apply Newton's second law: Force = mass × acceleration. A 2 kg ball accelerates at 3 m/s². What force is needed?

4. 4

   Drag the mass and acceleration sliders to see how force changes. Set mass = 4 kg and acceleration = 2 m/s² — what force do you get?

5. 5

   If mass = 5 kg and acceleration = 2 m/s², what is the force?

6. 6

   Now think about a rocket 🚀 — it pushes hot gas down, and the gas pushes the rocket up. That's Newton's third law: every action has an equal and opposite reaction.

7. 7

   When a rocket pushes gas downwards, what happens to the rocket?