EVERYTHING

VARiables/ Research ETc. etc. etc. Hello again! AS i have previously mentioned before, i am doing my experiment on-

'DOES TEMPERATURE AFFECT THE FORCE A RUBBER BAND CAN WITHSTAND BEFORE RUPTURE?'

The variables are:
INDEPENDANT VARIABLE: Temperature
DEPENDANT VARIABLE: Elasticity of a rubber band (The force the rubber band can withstand before it breaks)
CONTROLLED VARIABLES: Size of the rubber band, brand of rubber band, spring scale used, same fridge and oven.

EQUIPMENT NECESSARY (MAY CHANGE LATER) - spring scale -protective gloves (optional) - pack of rubber bands -same oven and fridge - safety goggles

METHOD (SUBJECT TO CHANGE):

1) Hang the spring balance from a secure post vertically.

2) Heat 15 of the same type of rubber band in the oven at 70 degrees celcius for 2 hours.

3) Take the rubber bands out of the oven and pull on spring scale with rubber band. Record results (force exerted before rupture of elastic band in a table).

4) Repeat steps 1-3, instead using 15x rubber bands at room temperature left for 2 hours, and 15x rubber bands at 0 degrees celcius for 2 hours.

5) Record and tabulate results.

For my other project ideas:

- does the design of a bridge affect the weight it can carry?

INDEPENDANT VARIABLE: Design of bridge

DEPENDANT VARIABLE: weight it can support/ carry

CONTOLLED VARIABLES: Material the bridges are made of, the length and size of the bridges, same weights used

-Does fertiliser actually affect the rate of plant growth?

INDEPENDANT VARIABLE: type of fertiliser

DEPENDANT VARIABLE: rate of plant growth

CONTROLLED VARIABLES: plant type, position and location of the plants, water and amount of fertiliser gaiven to each plant