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Effective Study 1. 2. 3. 4. 5. Review the material (mind map) Talk physics (flash cards, focus) Practise Questions (workbook or Exam) Mark and correct (make notes) Recommended Timing: 2.3 Waves (4 credits) 40 minutes 2.4 Mechanics (6 credits) 55 minutes 2.6 Electricity (6 credits) 55 minutes Circular Motion Centripetal force: caused by friction or tension or gravity Centripetal acceleration: due to a change in direction NOT speed Velocity Vectors have direction E 10° S Energy Separate vertical and horizontal motion Mechanics Momentum Torque (N m) (kg ms-1) τ = Fd p = mv Balance: Always conserved Clockwise torques = (unless acted upon by an unbalanced force) Impulse Δp = Ft anticlockwise torques Acceleration Adding vectors using Pythagoras Don’t forget the angle! Newton’s Laws of Motion 1st: An object will travel at constant velocity unless acted on by an unbalanced resultant force 2nd: Unbalanced resultant force leads to an acceleration F = ma 3rd: Every action has an equal and opposite reaction Friction and air resistance opposes motion v = fλ , T=1/f f is negative Di, Hi is negative Diverging Converging f is positive Di, Hi is positive Electromagnetic Spectrum Mirrors & Lenses Ray Diagrams Waves Standing Waves Longitudinal and Transverse Reflection Total Internal Reflection at critical angle Refraction: TAG AGA Diffraction, max if λ = gap longer λ get diffracted more Superposition & Interference Interference pattern Constructive (max amp) & destructive (min amp) Series and Parallel circuit rules Voltage, V, Volts Resistance, R, Ohms Energy, E, Joules Power, P, Watts Ohm’s Law graphs (V/I) Uniform Electric Field, E Current, I, Amps DC Electricity Static Electricity Force on a charge in an E-field Electricity Induced voltage generated across a conductor moving in a B-field & Generators DC Motor Electric potential energy, ΔE Electromagnetism Force on a charged particle in a B-field Force on a current carrying conductor in a B-field (motor effect)