Cool Physics Experiments

Liquid Light

Material Required

  • Baking soda
  • Dish detergent
  • Food colour
  • Warm Water
  • White Vinegar


Mix 2 tablespoons of baking soda.

1 teaspoon dish detergent

Add 10 drops of food colouring in 1 cup warm water.

Pour quickly into a glass containing 1/2 cup white vinegar

It works best with white tablecloth so you can really see the glow.

Make a Telescope



Telescope is an instrument that the observation of distant objects by collecting visible light. A telescope is a type of optical telescope that uses 2 lenses. The larger lens is placed on one end and the smaller lens at the other end. The objective collects light and focuses it as a sharp image.

Material Requirement

  • 2 Lenses
  • Plastic Tube or Paper
  • Glue gun
  • Masking tape


  1. Prepare all the needed materials.
  2. Get your first lens and place it inside (1 inch) in the first end of the plastic tube.
  3. Make sure it is placed properly and tape it into position with your masking tape.
  4.  Once it is properly taped, use a glue gun to stick the lens to the first end.
  5.  Do the same with the second lens to the other end of your plastic or paper tube.

Hole in Hand Trick

It shows you how to do a cool optical trick by putting a hole in your hand.


To understand how your eyes combine images.

Materials Needed

  • You’re Eyes
  •  Your Hand
  •  Paper Towel Tube


  1. Place a paper towel tube or a toilet paper tube up against one of your eyes.
  2. Place your hand and the end of the paper towel tube or in the middle of a toilet paper tube and slowly move your hand towards your face.

How Does it works :

The light passes through your eye it actives the leasing cells. These cells take light waves and turn it into electrical energy. This signal is sent down a cord known as the optic nerve. This information passes through a part of your brain known a corpus Col lo sum a portion of the brain that connects both sides of your brain as well as where eye signals cross over to the other side of the brain. The strong image from your left eye and the strong image from your right eye over lap each other which is why you see a hole in your hand. This upside down single image is sent to the back of your brain to an area known as the visual cortex. Here the electrical signals from the bottom of the eye are interpreted as up and the images you see are right side up.

Coin balance on Bill


To understand equal mass distribution

Materials Needed

  • Paper Bill
  •  Coin(s)

Get a hard paper bill and fold the bill in half and then put it on the table like a triangle.

Start with one coin and place this coin at the point edge of bill.

Slowly pull the edges of the bill apart until you get the coin to balance perfectly on the opened bill.
Repeat with 2 coins, then 3 coins and 4 coins.

How does it work :

Balance is the equalization of a push or pulls force where the mass of an object or force on an object equals the mass or force counting the object. Gravity is a force that pulls down on everything here on earth. It doesn’t matter whether you use one coin or four coins, as long as the coins mass is equally distributed on both sides of the bill the force of gravity will pull on both sides equally.
This happens because more of objects mass such as the coins are on one side of the bill then on the other side. This means that gravity will pull slightly harder on that side of the coin then it does on the other side of the coin crating an unbalanced force causing the coin to fall to that side.

Float an Egg in The Middle of Water


To understand how density works and how you can change the density of a liquid.

Materials Needed

  • Cups
  • Eggs
  • Salt


  1. Fill 3 glasses with 250ml of water and place a fresh egg in one of the glasses, watch as it sinks.
  2. Put 4 tsp of salt into one of the glasses stir it up and place an egg in the water. Watch as it floats.
  3.  Put 4 tsp of salt into the final glass stir it up and pour out some of the salt water. Now place an egg in the water.
  4. Slowly and carefully pour fresh water into the glass of salt water and watch as the egg sinks down till the middle.

How it Works :

Density is the amount of space something takes up per volume and when you add more mass to the same amount of space being taken up you can change the density of a liquid. When you drop a raw egg into fresh water the egg doesn’t move enough water making the egg denser then the water around it. When you add 4 tsp of salt to 250 ml of water and stir, the salt crystals break down into molecules and fill in the holes in between the water molecules. The solution now has more mass in the same space or volume, which changes the density of the water.

When you add the egg to the salt water you displace the same amount of water but that space has more molecules in it and the egg becomes less dense then the salt water around it. When you slowly add fresh water to salt water the less dense fresh water floats on top of the more dense salt water and you create a density Colum of water. The egg sinks through the less dense fresh water and floats on the more dense salt water.

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