Skip to content | Accessibility - list of access keys used on this site | Sitemap
Find what you need to know

Home > Subjects > Physics > Level 2 > 2.1 Physics investigation > Key tips

  • Subject: Physics
  • AS: 91168
  • Level: 2
  • Credits: 4
  • Internal

Physics 2.1 Carry out a practical physics investigation that leads to a non-linear mathematical relationship

Key tips

Follow the written instructions that will be given to you by your teacher.

Ask lots of questions.

If you draw a raw-data graph, make sure you can recognise from the shape of the graph the four types of relationships (linear, square, inverse, and inverse square).

You will be provided with a formula for the relationship between the variables.  Use this to help decide the type of relationship and which transformations will give you a straight line graph.  For example if you are investigating the relationship between the distance travelled by an accelerating object, and the time since it was at rest, the relevant formula is d= ½at2 .  So a graph of ‘d’ against ‘t2’ will produce a straight line with a gradient of ½a. 

Make sure you prepare for the assessment by knowing how to transform data from a non-linear relationship to give a straight-line graph.

Draw a careful and accurate straight-line graph with both axes carefully labelled with quantity and unit.  Don’t forget to transform your units.  For example, if one of your graphed variables is time squared (t2) then the units for that axis will seconds squared (s2).  The axis label will look like this: t2(s2). 

Draw a Line of best fit (LOBF) and use it to work out the gradient.  Be careful to use the line, not your data table, to find the gradient.  Show how you worked out the gradient by drawing a triangle on the LOBF.

The units of the gradient are the units of the ‘y’ axis over the units of the ‘x’ axis. For example, a graph of distance against time-squared will have units m/s2 or ms-2.

Give the mathematical relationship in terms of the actual variables, not ‘y’ and ‘x’.  For example a graph of ‘d’ against ‘t2’ with a gradient of 5.1 gives a relationship d=5.1t2

You can use your relationship to work out a value for a physical quantity or constant.  For example a relationship of d=5.1t2 can be equated with the provided formula d= ½at2 to give a=10.2ms-1.

Back to top

0

People logged in

71

People surfing this site

Most recent posts

English Level 1
2014 Level 1 English exam. How did it go?

Posted by: max_ridout

10:36am 27.11.2014

English Level 2
Level 2 English - How Did It Go?

Posted by: princess_ooz

3:40pm 16.11.2014

English Level 3 & Scholarship
2014 English- How did it go?

Posted by: cas

4:14pm 24.11.2014

Mathematics Level 1
Using Studyit during the holidays

Posted by: mathsteacher

11:07pm 27.11.2014

Mathematics Level 2
Using Studyit during the holidays

Posted by: mathsteacher

11:10pm 27.11.2014

Mathematics Level 3 Calculus & Calculus Scholarship
Using Studyit during the holidays

Posted by: mathsteacher

11:12pm 27.11.2014

Mathematics Level 3 Statistics & Statistics Scholarship
Using Studyit during the holidays

Posted by: mathsteacher

11:15pm 27.11.2014

Sciences Level 1
PHYSICS 1.3 ELECTRICITY & MAGNETISM 90937 EXTERNAL EXAM

Posted by: scienceteacher3

6:15pm 23.11.2014

Science Level 2 & 3
cells

Posted by: Doo

9:26pm 17.11.2013

Physics Level 2
PHYSICS 2.6 ELECTRICITY AND ELECTROMAGNETISM

Posted by: scienceteacher6

7:43am 18.11.2014

Physics Level 3 & Scholarship
2014 PHYSICS EXAM - HOW WAS IT?

Posted by: DashedDaBomb

5:25pm 26.11.2014

Biology Level 2, 3 & Scholarship
3.5 Speciation AS 91605 External

Posted by: cupcakesryum123

9:42pm 19.11.2014

Chemistry Level 2, 3 & Scholarship
2014 LEVEL TWO CHEMISTRY HOW DID IT GO

Posted by: einrebro

4:38pm 20.11.2014

Earth & Space Science
Where to find resources

Posted by: mathsteacher

11:13pm 14.10.2014

Other
Using Studyit during the holidays

Posted by: mathsteacher

11:24pm 27.11.2014