Paper 3

Section B

• Diagram 3.5 shows two catapults A and B made from same catapult rubber. Difference forces are applied on the catapults.

A B

Inference: extension of the spring depends on the weight of object.

Hypothesis:The bigger the weight, the longer the spring extension

Aim of the experiment: To determine the relationship between the weight and the spring extension

Variables:Manipulated: Weight of the loadResponding: Spring extensionConstant: Spring constant

Apparatus and Materials: Spring, pin, weights, plasticine, retort stand, metre rule

Arrangement:

Variables : Air pressure , Temperature.Manipulated :Responding : Constant :

temperatureAir pressureVolume of air

inference

RV depends on MV // MV affects RV

affects temperatur

e air pressure

hypothesis

•When increases, , increases

Temperature

Air pressure

aim

To investigate the relationship between

and

temperature

pressure

Method of controlling manipulated variable

• Manipulate variable : temperaturecontrol : the first temperature

Heat up the water to 20 0C

Method of measuring responding variable

• Responding variable : pressure

• Measure pressure using : Bourdon gauge

Using Bourdon gauge , measure the pressure and record the data

Analyse data

Temperature / K Pressure / Nm-2

20

3040

50

60

Graph

Temperature / K

Pressure / Nm-

2