cfakepathphysicssa2overallrevisionnotes-091005082916-phpapp01

# Cfakepathphysicssa2overallrevisionnotes-091005082916-phpapp01

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2009 Pure Physics SA2 Overall Revision Notes 1 Pure Physics SA2 Overall Revision Notes General Physics: Chapter 1 Measurement Physical Quantities Derived quantities (combining suitable base quantities) E.g. Velocity Base quantity Name of SI unit Symbol Length Metre M Mass Kilogram Kg Time Second S Electric current Ampere A Thermodynamic temperature Kelvin K Luminous intensity Candela Cd Amount of substance Mole mol Measurement of Length Very short (diameter of small wire) Micrometer Screw Gauge 0.01mm (0.001cm) Short (diameter of coin) Vernier Calipers 0.01cm Medium (Length of pendulum) Metre Rule 0.1cm Long (Length of vehicles) Measuring tape 1cm Vernier Calipers : Total the values of the main scale and vernier scale readings to obtain the correct reading. Remember to take note of zero error. Micrometer Screw Gauge : Total the values of the main scale (1mm) and circular scale readings (0.01mm) to obtain the correct reading. Take note of zero error. Measurement of Time: Time can be measured with a pendulum, clock or stopwatch. 1.) The time taken for 1 complete oscillation is called the period . 2.) The number of complete oscillations per second is called the frequency . 3.) The period increases with the length of the pendulum.

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2009 Pure Physics SA2 Overall Revision Notes 2 Pure Physics SA2 Overall Revision Notes General Physics: Chapter 2 Kinematics Types of Quantities Scalar Quantities are fully described by a magnitude only. Vector Quantities are quantities described by a magnitude and direction. Displacement: The distance measured along a straight line in a stated direction with respect to the original point (vector). Velocity: Rate of change of displacement Displacement (m) Velocity Time Taken (m/s) Acceleration: Rate of change of velocity Note: Negative Acceleration = Retardation Final Velocity Initial Velocity Acceleration Time Taken (m/s) Distance (m) Displacement – Time Graphs (xt Graphs) 3.) Used to show displacement over time. 4.) Horizontal line: Body at rest. 5.) Straight line with positive gradient: Uniform Velocity. 6.) Straight line with negative gradient: Uniform velocity in the opposite direction. 7.) Curve: Non – uniform velocity. 8.) The gradient of the tangent of this graph gives the instantaneous velocity of the object. Velocity – Time Graphs (vt Graphs) 1.) Used to show velocity over time. 2.) Such a graph can be used to find: a. Velocity b. Acceleration: Gradient c. Distance travelled: Area under the graph. Acceleration of Free – Fall 2. The acceleration of free-fall near the surface of the Earth is constant and is approximately 10m/s 2 . It is derived from the gravitational force felt by objects near the Earth surface and independent of the mass of any object. 3. Speed of a free-falling body (experiencing no other forces other than gravity) increases by 10m/s every second or when the body is thrown up, it decreases by 10m/s every second.
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## This note was uploaded on 09/07/2011 for the course RANDOM R 101 taught by Professor T.s. during the Fall '11 term at Research College.

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Cfakepathphysicssa2overallrevisionnotes-091005082916-phpapp01

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