Investigating the stretching of rubber bands

1
Investigating the stretching of rubber bands

• Which VARIABLE are you testing?

The weight or mass of the rubber band
The length by which it is stretched
The thickness of the rubber band
The force applied to the rubber band
The length of the rubber band
2

• The variable that you change deliberately is
  called the INDEPENDENT VARIABLE.
• The variable that you measure is called the
  DEPENDENT VARIABLE.
• All other factors must not be allowed to change.
  Otherwise your results will not be VALID.

3
what will you need?
A metre rule?
A clamp and retort?
Or maybe some standard weights?
A newton -meter?
How many rubber bands?
4

• AIM We are going to investigate how the
  __________ of the rubber band affects the force
  needed to stretch it.
• PREDICTION I think that the _______er the band,
  the ________er the force will need to be to
  stretch it.
• APPARATUS Make a list here.

5

• METHOD
• Write in point form.
• Arrange your steps in a logical order
• A large, neat and labelled diagram always helps!
• Make sure that you write down what needs to be.
  
• 1. changed 2. kept constant 3. measured
  and recorded 4. repeated

6

• RESULTS
• prepare your table before you start taking
  readings.

These columns may be different depending on what
your group has chosen to investigate.

• Points to think about
• Are you going to apply the same force to each
  band, then record the length it has stretched?
• Are you going to stretch the elastic bands by the
  same amount, and record the force needed to do
  it?

7

• Once you collect your results.
• You will need to plot a line graph
• Then write a conclusion
• Then write an evaluation.