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Once upon a time, deep under the sea, there was a 

mermaid named Ariel. Ariel was very adventurous, 

and loved to find new things. She dreamed of one 

day being able to explore the outside world. 

Ariel loved finding treasures from the outside world. Often, 

she would find things that sank down from the surface. 

Many were very heavy and precious objects, and the large 

gravitational pull(due to a large mass) caused them to 

drop very fast. What a sight to see a shiny hairbrush 

rocketing down through the water!

Gravity

Buoyancy

One day, Ariel was admiring the sunshine when a 

huge ship floated by. The ship bobbed on top of 

the water, back and forth. This was made possible 

because the buoyant force of the water was 

stronger than the ship's gravity. 

Gravity

Buoyancy

Ariel saw a handsome prince on the mysterious 

ship, so she decided to follow it to shore. When she 

reached the beach, she watched the prince pull up 

his little row boat that he used to get to land. 

Because of friction, the boat was able to stay on 

shore instead of washing away. There was no 

movement because the forces were balanced. 

Pull

Friction

Suddenly, a whirlpool appeared and pulled Ariel 

under! Due to centripetal force, she spun around and 

around, until finally she stopped. When she looked 

up, there was an ugly sea lady in front of her.

The lady's name was Ursula, and she gave Ariel legs so she 

could meet her prince. Since Ariel lost her tail, she experienced 

a mass and weight change, resulting in a different overall 

density. She had to get used to getting around with two legs, 

instead of a tail. It was harder for her to float, because her mass 

change made her increase in weight, so she had a larger 

gravitational pull. 

Gravity

Buoyancy

Ariel met her prince charming, 

and they immediately fell in love. 

They got married...

...and lived happily ever after.

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