Coin Dive

Coin Dive


- A piece of cardboard that is strong but flexible
- A ruler
- A pencil
- Scissors
- Tape
- A small container – about the size of a film canister
- A 10c coin


1. Measure a strip of cardboard about 2cm wide.Form it into a hoop – this works best if the hoop is 8 – 10cm across.Trim off any extra cardboard and use a bit of tape to secure your hoop.
2. Half fill your container with some water.Place the hoop on top of the container so it’s resting on it’s own.
3. Carefully place your coin on the top of the cardboard hoop so it’s balanced and sitting directly above the plastic container.You might need to shift it around a little bit until it’s perfectly balanced and stays balanced without you holding on.
4. Once you’ve got this all set up – take your pencil, poke it just inside the cardboard hoop and give it a good, hard flick directly out to the side… The hoop should flick forcefully out to the side… what happened to your coin?Did it fall directly into the water?

The Extreme Science behind this:

This experiment show’s Newton’s First Law of Motion in action!Newton’s First Law of Motion is that if an object is at rest, it will stay at rest unless acted upon by an outside force, and if an object is in motion it will stay in motion in the same speed and direction unless acted upon by an outside force.

This is what happened with the coin and the hoop:
The hoop and coin were both at rest.Then the hoop was acted upon by an outside force when you flicked it to the side with your pencil.
The coin hadn’t been acted upon by an outside force – so it stayed at rest – but without the hoop, the coin has nothing to hold it up…so the outside force of gravity takes over… sending the coin straight downwards into the plastic container of water!

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