1. Lenses: Describe how a convergent lens works: Describe how a divergent lens works: Describe how the lens works in the eye: P3 REVISION – CHAPTER 1 – MEDICAL APPLICATIONS OF PHYSICS KEY WORDS: Radiograph Charge-couple device CT scanner Transducer A-scan Refraction Snell’s law Refraction index Endoscope Converging lens Diverging lens Principal focus Magnifying Focal length Image ASSESSMENT: X-rays: Explain what an x-ray is:Describe some of the safety issues with X-rays: Describe what a CT scanner is: Ultrasound: Describe how an ultrasound works:Explain how an ultrasound can be used to measure distance: Explain some of the therapeutic uses of ultra sound: Endoscope: Describe how an endoscope works:Describe how we use endoscopes in medicine:

2. P3 REVISION – CHAPTER 2 – USING PHYSICS TO MAKE THINGS WORK KEY WORDS: Load Effort Pivot Line of action Centre of mass Equilibrium Moments Resultant Pressure Pascal (Pa) Hydraulic Centripetal Oscillation Amplitude Frequncy ASSESSMENT: Centre of mass: Describe what the centre of mass of an object is: Draw the centre of mass on these shapes: Moments: Describe what a moment it: Complete the equation: Moment = ____ X perpendicular distance from the line of the force to the pivot ______ newtons ________ ______ Nm m Circular motion: Explain centripetal force and the factors that affect it: Moments in balance: When a see-saw is balanced: the anticlockwise moment due to W 1 about the pivot = W 1 d 1 the clockwise moment due to W 2 about the pivot = W 2 d 2 Calculate W 1, if W 2 = 7.0N, d 1 = 0.40m and d 2 = 0.25m Stability: Explain the following: Tractor safety: Bus tests: High chairs:

3. P3 REVISION – CHAPTER 3 – USING MAGNETIC FIELDS TO KEEP THINGS MOVING KEY WORDS: South pole North pole Magnetic pole Magnetic field lines Motor effect ‘Split-ring’ commutator Induction Transformer National grid Step-up transformer Step-down transformer ASSESSMENT: Explain how an electromagnet works: Explain Fleming’s left hand rule: Explain how an electric motor works: Explain how a transformer works: Explain electromagnetic induction: