desperate help on controls and variables

[Guest dreamer80]

hi

 

i am doing an experiment on testing strength of glues

i do this by putting 2 block of wood glued together and screwed on either side are 2 hooks. i hang this onto another hook which is on a wall and with the remaining hook i put weight on it till the blocks of wood separates...i do this in 4 different condition for each brand of glue, cold, hot, wet and room temperature.

what is my control/s? and explained why

what is my experimental variables and the variables i need to keep the same?

 

identified variables and units that will be used to collect the data...

 

please help quickly!!!

 

thank so much

[wolfson]

control variable the size and weight of the wood must be equal, also the hanging equipment. If they were different this could alter (and would) your results and your experiment would not be correct.

 

independent variables the things you will change the temp and dampness.

 

Keep the same control variables. And the time you it will take to brake the bond between wood and glue is a dependent variable.

[Guest dreamer80]

thank you!!