Year 9 January Physics Revision PDF

Year 9 Revision - January Physics Exam Use the resources on WHS Campus for revision if you need them. Topic Content Keywords / Examples Done? Seeing & Know that we see things because light is reflected off Reflectio...

Year 9 Revision - January Physics Exam Use the resources on WHS Campus for revision if you need them. Topic Content Keywords / Examples Done? Seeing & Know that we see things because light is reflected off Reflection Reflection surfaces into our eyes. Light ray Law of The angle of reflection is equal to the angle of Reflection incidence. The Eye Know the major components of the human eye’s Cornea structure. Pupil Understand how each part functions, enabling us to Iris see. Aqueous humour Retina Blind spot Optic nerve Cilary Muscles / Body Refraction Know that light bends when it travels from one T - towards medium to another because it changes speed. A - air G - to glass Know that it travels more slowly in optically denser A - away materials and fastest in a vacuum G - glass A - to air Lenses Lenses work because their curved surface refracts Focus the light and bends it. Convex To a focus (Converge) = convex / converging lens Concave Spreads out (Diverges) = concave / diverging lens Dispersion Know that white light can be split into the colours of Dispersion the rainbow by refracting it through a prism. This is Split called dispersion. Rainbow RED, ORANGE, YELLOW, GREEN, BLUE, INDIGO, ROYGBIV VIOLET Speed Understand that this occurs because violet light slows down more and bends more than red light. Electro-magn Understand that visible light is a small section of a Gamma etic Spectrum large range or spectrum of similar waves. X-Ray (E-M) Be able to recall the E-M Spectrum in order. Ultraviolet Identify uses and dangers. Visible All E-M waves travel at the speed of light through a Infrared vacuum. Microwaves Radio Static Understand that static electricity is the buildup of Electron Electricity charge due to Charge the movement Positive of electrons Negative from one material to another. In this example the cloth has lost electrons to the rod when they rubbed together. Electricity Electrical Symbols Terminal Lamp Switch Cell Battery Conductors Conductors allow charged particles (free Electrons and Insulators electrons) to flow through them. Insulators do not. Flow All metals are conductors plus carbon/graphite Metals Graphite Conductors Insulators Electrical Series Circuits Parallel Characteristi Know that: Open circuit cs of Series A series circuit has only one route for the current Closed circuit and Parallel so any gap (open switch / broken bulb) will stop Circuits. the current. A parallel circuit has multiple routes for the current to flow round so a gap only results in a particular route stopping, not the whole circuit. This makes parallel circuits more useful. Understand how the brightness changes when cells and bulbs are added into the different types of circuit. More cells = more energy = brighter In series they get dimmer the more bulbs are added  The bulbs remain at the same brightness when more are added in parallel. Electro - Know how an electromagnet can be made and Soft Iron core magnetism how its strength is increased by: Coil Increasing the number of coils Insulated wire Increasing the current Solenoid Putting a Iron core down the middle of the coil