Topic 4 - Floating and Sinking

 Floating or Sinking - Buoyancy Experiments:

Aim/purpose: Find out what is positively buoyant (can float) and negatively buoyant, (cannot float), and to predict what the outcome of one object will be.

Definitions:

Float - On the surface of liquid, (most of the time, water)

Sink - Can not float and object goes under the liquid.

Semi-float - Where something can float but half of it is in the liquid, (between floating and sinking).

How something floats: It has enough air and isn’t too heavy.

How something sinks: Where something doesn’t have enough air, is heavy and dense; Thus, the object sinks.

Buoyant - The term for something that can float.

Negatively buoyant: Term for something that can’t float.

Positively buoyant: Term for something that can float.

Recording our buoyancy testing

Predicting what the outcome may be and if our predictions are proven wrong or correct.

Name of object	Size - cms L-W-D or diameter	Weight : gms	Composition (what it’s made of)	Prediction Float or sink	Buoyancy result
Golf ball	12.7cm	45.76gms	Plastic stuffed with rubber	It won’t float. It seems a bit too heavy.	It didn’t float, (correct)!
Tennis ball	21.1cm	54.40gms	Hollow inside, fabric outside.	Semi float.	It semi -floated, (correct)!
Ping pong ball	12.4cm	2.29gms	Plastic, inside is hallow.	Float.	It floated, (correct)!
Small marble	5.7cm	5.33gms	Glass	Float	It didn’t float, it sinked, (incorrect)!
Big marble	9.4cm	20.43gms	Glass	Sink	It sinked, (correct)!
Big lego	3.7cm	8.33gms	Plastic	Float	Floats/semi-floated, (correct)!
Small block	1cm	0.50gms	Wood	Float	Float/semi-floated, (correct)!
Medium block	1.9cm	3.80gms	Wood	Semi-float	Semi-floated, (correct)!
Long block	10cm	19.41gms	Wood	Semi-float	Semi-floated, (correct)!

Wide block	14.1cm	116.43gms	Wood	Sink	Semi float, (incorrect)!
Styrofoam	3.2cm	0.15	Styrofoam	Float	Floats, (correct)!

Hello everyone this is what we did at tech last week, we put some objects into a bucket of water and we have to predict if it would float or sink. Thank you for looking at my blog bye!