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Once upon a time, there was a family that had 

three boats. This family loved to sail.

There was a girl who loved to sail. She saw the 

three boats and really wanted to get out on the 

water.

The 1st boat wasn't built            The eager sailor 

properly and sunk                       was able to get

to the bottom of the                  back to the 

ocean. The force of                         surface.

gravity (represented

with the black arrow)

is stronger than

the force of

buoyancy 

(represented by

red arrow) The forces

are unbalanced.

The second boat seem fine but moved very 

slowly. After an inspection, the eager sailor 

found that the mass of the two boats were the 

same but it's               almost like it's weight 

was more.                  With further inspection,                            

the eager sailor realized that                                 

the anchor was dropped.

The force of friction was resisting the anchor's 

movement slowing down the boat. 

The anchor was at the ocean floor 

having it's motion being resisted by 

friction because it's density was more 

than the density of water. If it's density 

was less than the density of water, it 

would float on or above the surface of 

water. 

The eager sailor turned around and went back 

to to the dock where she found the three 

boats. With one last attempt, she took out the 

final boat. 

The final boat 

was perfect. 

The boat sailed 

without much 

friction 

opposing it. 

The forces of 

buoyancy and 

gravity were 

balanced.  

 The wind blew the sail around the mast, but the 

sail stayed on because of centripetal force. 

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