Monday, 23 January 2012 Why Study Physics? Any ideas?

Monday, 23 January 2012 An understanding of the world around you

Monday, 23 January 2012 Innovation and invention to make your life easier

Monday, 23 January 2012 Develop your analytical skills

Monday, 23 January 2012 You will always win that argument

Monday, 23 January 2012 It opens many opportunities in and out of the sciences

Monday, 23 January 2012 Where can I go with Physics?

Monday, 23 January 2012 Lets talk money

Monday, 23 January 2012 What’s in the course? ASTopicCredits How Assessed AS Carry out a practical physics investigation that leads to a non- linear mathematical relationship 4Internal AS Demonstrate understanding of physics relevant to a selected context 3Internal AS Demonstrate understanding of waves 4External AS Demonstrate understanding of mechanics 6External AS Demonstrate understanding of atoms and radioactivity 3Internal AS Demonstrate understanding of electricity and electromagnetism 6External Total Possible Credits 26

Monday, 23 January 2012 What’s the plan? ContentImportant Dates Term 1 Review Mathematical and Practical Skills 2.4 Mechanics Practise 2.1Week 8 Practise 2.4Week 10 Term Waves 2.5 Atomic Physics 2.2 Physics in Context Practise 2.1Week / 2.5 Internals (3+3 credits) Due week 10 MID YEAR EXAM: MECHANICS, WAVES, ATOMIC – week 8 Term Electricity 2.1 Investigative Physics 2.1 Internal (4 credits) Week 3 ALL RESITSWeek 11 END OF YEAR EXAM: MECHANICS, WAVES, ELECTRICITY – week 10 Term 4 Revision for external examsStudy leaveWeek 5 NCEA Physics Exam

Monday, 23 January 2012 Maths Skills 1.You need good algebra to rearrange equations 2.You need trigonometry to deal with angles 3.You need good graph skills to show relationships 4.You need knowledge of standard form to deal with very big and very small numbers

Monday, 23 January 2012 Algebra Most equations can be put into a triangle: P = IV  Others need the algebra rules to rearrange: a 2 = b 2 + c 2 P VI

Monday, 23 January 2012 Practise Rearranging Equations

Monday, 23 January 2012 Trigonometry Life doesn’t always occur horizontally... SOH CAH TOA will guide you

Monday, 23 January 2012 Practise Trigonometry

Monday, 23 January 2012 Graphs – what is the point? Graphs prove a relationship between two variables: What are the dependent and independent variables? Describe the relationship.

Monday, 23 January 2012 Plot these graph and describe the relationship Mass (g)Volume (cm 3 ) Distance (m)Time (s) What I should see: 1.Correctly scaled axes (that fill the page) 2.Axes labelled with symbol/quantity AND unit 3.Points all plotted correctly with ‘x’ or ‘o’ 4.Line or curve of best fit

Monday, 23 January 2012 Common Relationships in Physics Linear :Square: Inverse:Inverse squared:

Monday, 23 January 2012 Proportional:∝ Linear Relationships: distance ∝ velocity voltage ∝ current Square relationships: Energy ∝ velocity 2 Inverse relationships: Frequency ∝1/period of oscillation Acceleration ∝ 1 / mass Inverse squared relationships: Gravitational Force ∝ 1 / radius 2

Monday, 23 January 2012 Standard or Scientific Notation Do you know this number, 300,000,000 m/s? It's the Speed of light ! How about this one, kg. ? This is the mass of a dust particle! Scientists have developed a shorter method to express very large numbers. This method is based on powers of the base number 10. The number 123,000,000,000 in scientific notation is written as: Coefficient Exponent

Monday, 23 January 2012 How do you do it? 1.Drop the point after the first non zero number 2.Count the number of places from the point till the end of the number to get the exponent. 3.Numbers less smaller than 1 will have a negative exponent. A millionth of a second is: sec. Write this in standard notation.

Monday, 23 January 2012 Practise these A B C.4050 D

Monday, 23 January 2012 Powers of 10 PrefixNumberPower Giga, G Mega, M Kilo, k Milli, m Micro, μ Nano, n Pico, p

Monday, 23 January 2012 Significant Figures