Tech - Sink or Float

 Topic 4 - Floating & Sinking

Can you explain floating & sinking? Why something floats Why something sinks Why something semi floats                  Float-Light, full of air        Sinks-Heavy,No air Semi float-Some air,heavy/light (50/50) Notes: Buoyancy/Floating and sinking Light / Positively Buoyant Weight / Negatively Buoyant Density-mass=how heavy Archimedes Principle = Gave us density and buoyancy  Something heavy needs space

Buoyancy Experiment

Buoyancy Experiment Purpose: Predict and test the buoyancy of objects. Equipment: Balls: Marbles Golf Ball Table Tennis Ball Tennis Ball Blocks of materials Wooden Blocks Plastic blocks Polystyrene rectangle

Recording of Buoyancy Experiment

Name of Object	Size/CM	Weight	What it’s made of	Float or Sink	Result
Golf Ball	14.8 cm	46.10 grams	Hard plastic	sink	sink
Ping Pong	11.1 cm	2.59 grams	Soft plastic	float	Float
Small Marble	5 cm	5.15 grams	Glass	semi-float	sink
Big Marble	6.2 cm	22.67 gram	Glass	sink	sink
Tennis	20.5 cm	56.81 grams	Rubber	float	semi-float
Wood block	9.9 cm	18.94 grams	wood	semi-float	semi-float
Small Cube	1 cm	7.95 grams	wood	float	semi-float
Styrofoam	6.7 cm	0.41 grams	styrofoam	float	float
Cube	1.9 cm	4.59 grams	wood	semi-float	semi-float
Plastic Block	3 cm	8.49 grams	plastic	semi-float	semi-float
Wood Rectangle	14 cm	116.96 gm	wood	Semi-float	semi-float

Method:

Fill bucket with water, measure and weigh each object, put object in water (see of float or sink).