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

298

People surfing this site

Most recent posts

English Level 1
Length of Visual and Written essays

Posted by: englishteacher8

3:20pm 14.11.2017

English Level 2
91098 [2.1] Level 2 WRITTEN text post all your Qs here

Posted by: Aquiilla xo

5:57pm 20.11.2017

English Level 3 & Scholarship
Level 3 2017 Unfamiliar Texts- How Did It Go?

Posted by: Torpeylcr

8:47pm 14.11.2017

Mathematics Level 1
2017 LEVEL 1 MATHS EXAM COMMENTS - How did it go?

Posted by: littlefluffybear

6:00pm 21.11.2017

Mathematics Level 2
Probability and Simulation (91267, 91268)

Posted by: mathsteacher15

4:01pm 22.11.2017

Mathematics Level 3 Calculus & Calculus Scholarship
mathematic with calculus

Posted by: mathsteacher15

4:01pm 12.11.2017

Mathematics Level 3 Statistics & Statistics Scholarship
Level 3 Calculus Linear equations

Posted by: mathsteacher4

11:34am 13.11.2017

Sciences Level 1
SCIENCE 1.5 ACIDS & BASES 90944 EXTERNAL EXAM

Posted by: madeline5

2:29pm 05.11.2017

Physics Level 2
PHYSICS 2.6 ELECTRICITY AND ELECTROMAGNETISM

Posted by: scienceteacher3

11:42am 08.11.2017

Physics Level 3 & Scholarship
PHYSICS 3.1 PRACTICAL INVESTIGATION

Posted by: scienceteacher3

8:56pm 20.11.2017

Biology Level 2, 3 & Scholarship
NCEA Level 2 Cellular Respiration

Posted by: scienceteacher5

9:10pm 13.11.2017

Chemistry Level 2, 3 & Scholarship
CHEMISTRY 3.4 NEW Bonding and thermochemistry external

Posted by: scienceteacher13

10:16am 15.11.2017

Earth & Space Science
Where to find resources

Posted by: Josephbd

6:46pm 25.11.2015

Other
Who took year 11 general science?

Posted by: KingDavidFromFiji

9:03pm 30.10.2017