Topic 4(STEM 2021 TECH)

 Topic 4:

Task 1:

Float: Light,Fly,on the surface of water.

Sink: Heavy, goes down,

Semi Float: Float and sink at same time.

What makes something float or sink?

Buoyancy: Float/sink.

Buoyant:Floats

Positively Buoyant.

Density:

The amount of Mass something has,relative to its volume.

Archimedes Principle:

Basketball has air so it can float.

Rolling ball has Mass so it will sink.

Task 2:

Float or Sink- Buoyancy Experiments

Aim or Purpose: Predict and test the buoyancy of objects

Equipment:

•   A variety of balls

• Marbles- large and small size

• Golf ball

• Table Tennis Ball

• Tennis Ball

Name of Object	Size-cms L-W-D	Weight	Composition	Prediction	Result
Tennis Ball	21cm	63.07	Fabric	Float
Marball	5cm	2.29	Glass	sink
Table Tennis	21.3cm	2.30	Glastic	Float
Golf Ball	15cm	35.15	Rubber	sink
Medium Marball	5.5	15.33	Glass	sink
Wood plank	10cm	20.18	Wood	sink
Wood cube	1cm	0.46	Wood	Semi Float
Small cube	1cm	0.46	Wood	Float
Medium Sqaure	14cm	111.73	Wood	Semi Float
Foam	7cm	0.42	Foam	Float
Cube	3.7	8.78	Plastic	Semi Float