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CONTROLLING VARIABLES – YEAR 6

1. Figure 1 show the apparatus used in a study. In container W  is one rat, incontainer X  are two rats and in container Y  are three rats. It was foundthat the rats in container Y  died the fastest while the rat in container W  was the last to die.

a) State two information variables that need to be collected from thisexperiment.

 ________________________________________________________ 

. !hree bric"s that are the same are pulled up the inclined planes P , Q andR  with the same amount of force. !able shows the time ta"en to reach thetop.

  Table 1a) State two factors that need to be ta"en into account.

 _____________________________________________________ 

Inclined plane Time taken (!

P 

R 

1#$%

Glasscontainer 

glass cover 

rat 

Figure 1

W X Y

P Q R 

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  b) &hat variable must be "ept the same'

  ____________________________________________________  

Figure 2 

%. Fish P  and fish Q are freshly caught from the river. Fish P  is "ept in thefridge while fish Q is left in the cupboard in the "itchen. !he next day, it isfound that fish P  is still fresh but fish Q is already smelly.

a) In this investigation, state the thing that is.

i) (hanged  ___________________________________________ 

ii) *bserved  ___________________________________________ 

  b) &hat is "ept the same in this experiment'

  _____________________________________________________ 

Figure 3

+. Figure % shows a lever system set up to move a roc". !able shows theforce needed to lift the roc".

  "o#ce applied "o#ce needed (N!

 X Y Z 

#11#

  Table 2 

  a) In this investigation, state the thing that is

i) changed _____________________________ 

Z Y  X 

-oc"

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  ii) measured ______________________________ 

b) &hat variable must be "ept the same'

  ____________________________________________________  

. Figure % shows the force needed to drag a load on two different surfaces.!he time ta"en to drag the load over a distance of metres is 1 seconds.

Figure 3

a) &hat are the two things that should be "ept the same to ma"e this testfair'

i) ______________________________________________________ 

  ii) ______________________________________________________ 

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Anwe# $ CONTROLLING VARIABLES % Yea# 6 

1. a) !he number of rats and lifespan. a) i) !he height of the inclined plane  ii) !he time ta"en to reach the top.

b) Sie / mass / weight of the bric" / amount of force applied

  %. a) i) !he place where the fish is placed  ii) !he condition of the fish

  b) !ype of fish / !he freshness of the fish before experiment

+. a) i) !he distance of force from the fulcrumii) 0mount of force needed

  b) !he weight / mass of the roc"

. a) i. !he type of the surface areas  ii. !he number of pupils needs to drag the load