Science Experiments to do at home for kids | Working DIY School Model | Self Spinning ball

TL;DR

When a hollow ball filled with water is spun and then stopped, the inertia of the moving water causes the ball to continue spinning on its own.

Transcript

if we stop a spinning ball what do you think should happen it should stop right let's try this experiment with this spinning one what do you think would happen if i rotate this ball really fast and then suddenly stop it you might be thinking that the ball would stop it started spinning again even after it was stopped let's understand the science be... Read More

Key Insights

• 💦 When spinning a hollow ball filled with water and suddenly stopping it, the inertia of the moving water causes the ball to self-spin.
• 💦 This self-spinning effect is due to the difference in inertia between the ball and the water inside it.
• 🚾 Objects with different inertia than the ball, such as fluids like water, milk, or oil, can create the self-spinning phenomenon.
• 👻 The inertia of the ball is dependent on the contents inside it, allowing for different self-spinning behaviors.
• 🪺 The self-spinning effect can be observed in other scenarios, like spinning a raw egg with liquid inside or a boiled egg without liquid inside.
• ⚾ Experimenting with various objects inside the ball can lead to different self-spinning results based on inertia differences.
• 💬 Understanding the science behind self-spinning balls helps explain the phenomenon and encourages further experimentation.

Questions & Answers

Q: Why does a spinning ball stop when we stop applying force to it?

When we stop applying force to a spinning ball, the ball's inertia, which keeps it moving, is also stopped. Without external force or inertia, the ball comes to a rest.

Q: Why does a hollow ball filled with water continue spinning after being stopped?

The inertia of the water inside the hollow ball keeps it in motion. The moving water creates a self-spinning effect even after the ball is stopped.

Q: Can any object inside a ball create the self-spinning effect?

No, only objects with a different inertia than the ball can create this phenomenon. Fluids like water, milk, or oil work best. If the object inside has the same inertia as the ball, it will come to a stop.

Q: What happens if we put sand inside the ball instead of water?

When sand is put inside the ball, the combined inertia of the sand and the ball becomes one system. As a result, when the ball is stopped, the overall inertia of the system becomes zero, and the ball comes to a stop.

Summary & Key Takeaways

• Spinning a hollow ball filled with water and then stopping it causes the water's inertia to keep it spinning.

• The motion of the water inside the ball generates a self-spinning effect even after the external force is removed.

• Objects with different inertia than the ball, such as fluids like water, milk, or oil, can create this self-spinning phenomenon.