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Thursday, 17 June 2021

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). 





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