## 12 November 2012

### Tips and Predictions Physics SPM 2012

 SECTION A 1 Introduction to Physics Micrometer screw gauge and zero error 2 Force and Motion Impulsive force Definition of a force. Net force, Forces in equilibrium, F =ma 3 Forces and Pressure Definition of pressure Pressure, Pressure and depth, Calculation of pressure 4 Heat Definition of specific heat capacity Specific heat capacity and calculations Gas laws 5 Force and Pressure Floatation, Definition of buoyant force Buoyant force and calculations. Hot air balloons (compare small and big balloons) in terms of buoyant force. 6 Waves Definition of interference Interference of light, Young’s double slits experiment Calculation of wavelength using  λ =  ax/D Comparing the fringes using blue light band red light 7 Electricity Definition of power and specifications Calculation of I = P/V Effective resistance, Resistor in parallel and series, calculation of electrical energy, and power. Modifications of circuits and reasons to give smaller effective resistance ,R 8 Electronics What is semiconductor.. Rectification circuits choose the correct one for full wave rectification and give reasons. Transistor as a switch, relay, LDR, thermistor and Logic get circuit. Most suitable circuit   for street light, certain function and give reasons.

 SECTION B 9 Light Focal length, power= 1/ f, lens equation, How magnifying glass works? How telescope works , ray diagrams 10 Radioactivity Radioisotope, decay graph, half-life. Use of radioisotope in industry to detect the volume of liquid in a container. Suggestions.

 SECTION C 11 Force and Pressure Fluid in motion : pressure and velocity of flow. Bernoulli’s principle, lift force, Explanation of lift force using aerofoil Suggestions to make a water rocket that can reached high altitude. 12 Electromagnetism Inductions + Lens and Faraday Law Specifications of motor, explain how a motor works. Calculation of transformer Choosing a fan that can produce fast cooling effect or transformer Choose the transformer that is of high efficiency .

PAPER 3
 SECTION A 1 Light Experiment to investigate relationship between u and v or can also be refraction of light. Read also the snell law : how to read a protractor to find angle of incident and refraction. 2 Graph of voltage across a dry cell against current to find e.m.f and internal resistance. Calculation of gradient of graph.

 SECTION B 3 Heat Specific heat capacity To investigate the relationship between mass, m and temperature rise at constant electrical energy supplied. Using immersion heater and thermometer , etc. 4 Waves Refraction To investigate the relationship between wavelength and depth. Using ripple tanks and accessories

To investigate the relationship between the depth of liquid and pressure in liquid
To investigate the relationship between the depth of immersion and buoyant force.
To investigate the relationship between the mass of water and increases in temperature
To investigate the relationship between the pressure and volume of air (Boyl’e Law)
To investigate the relationship between the temperature and volume of air (Charles Law)
To investigate the relationship between the temperature and pressure of air (Pressure’s Law)
To investigate the relationship between the current and potential difference (Ohm’s Law)
To investigate the relationship between the length of wire and the resistance of the wire
To investigate the relationship between the cross sectional area of the wire and the resistance of the wire
To investigate the relationship between the temperature of the wire and the resistance of the wire
To investigate the relationship between the number of turns of coil and the induced current
To investigate the relationship between the speed of magnet and the induced current

*******Good Luck*******