Tech @ Tamaki Stem/Science

Can you explain floating and sinking?

Why does something float? Floating is when something is very light floats.

Why does something sink? Sinking is when something heavy goes down the water.

Why does something semi-floats? Semi-float is when you can see the object at the bottom and the top.

Notes/Ideas: Things float because they have air in it or they are light. Things that sink are because they are heavy and have no air in them. Example, when people die in water they float because their blood is gone. Cruise ships float because of the air and the shape of it. A bowling ball will sink because of its mass and the basketball will float because it has air in it. If you take a bath and sit in the bathtub, the water will rise because of your mass and how much space you take up. Submarines can sink and float because when they have air or water they float but when they have no air or water, they will sink!

Buoyant - Float

Negatively Buoyant - Sink

Buoyancy Experiment


Aim or Purpose: Predict and test the buoyancy of objects.

Equipment: Marbles, Golf Ball. Table Tennis Ball, Tennis Ball, wooden blocks, plastic blocks, a water bath.

Name of Object:

Size

Weight

Composition

Prediction

Buoyancy Result

Ping Ball

13 cm

0.81 grams

Plastic

I know it’s gonna float.

FLOATS!


Golf Ball

14.3

43.50 grams

Hard Plastic

I know it’s gonna sink!

SINKS!


Big Marble

8 cm

20.87 grams

Limestone

It’s gonna sink.

SInk!


Small Marble

5 cm

5.13 grams

Limestone

Sink and float.

Sink!


Tennis Ball

20.5 cm

45.10 grams

Rubber

Float And Sink

SEMI-FLOAT!


Starro Foam

6.5 cm

0.42 grams

styrofoam

float

Float


Block

4.9 cm

8.58

plastic

Float and sink

Semi-float


Tiny wood cube

0.8 cm

0.54

Wood

Float

Semi-float


Small wood cube

1.9 cm

4.51 grams

Wood

Semi-float

Semi-float


Medium wood rectangle

10.1 cm

19.39 grams

wood

Semi-float

Semi-float


Big wood rectangle

14.3

115.48 grams

wood

Semi-float

Semi-float

Method: We measured the balls with the string and ruler. We then weighed them and found out what they are made out of and predicted if it was gonna float or sink or semi-float. We did the same thing with the wooden blocks.

Hey everyone, it's Finau and this is my science experiment I did at Tech. I did this experiment with Roman. I found it fun and interesting. I hope you have enjoyed this post. Please leave a positive comment on my blog. Bye!