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Measurements

This powerpoint contains the basic information you require for your Physics Practical Examination. Do not rely solely on this – your Practical Booklet contains much more information!!!. Measurements.

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Measurements

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  1. This powerpoint contains the basic information you require for your Physics Practical Examination. Do not rely solely on this – your Practical Booklet contains much more information!!!

  2. Measurements • Repeat and average when time permits. A large space for recording results may indicate that repeats are required: T in s X in cm • When recording measurements always state the unit. In a results table or graph this is done as above (click to see)

  3. Record measurements to the correct number of significant figures. • e.g. an object exactly 20 mm long should be recorded as: • 20 mm when using a ruler • 20.0 mm when using vernier calipers • 20.00 mm when using a micrometer screw gauge.

  4. Calculations • Always pay attention to the units each quantity is measured in: I needs to be converted into amps in order to calculate R in ohms

  5. A calculation can only be as accurate as the least accurate value used in the calculation. Click to see solutions. t2 s2 Not 0.062 or 0.062001 0.0620 Not 0.086 or 0.085849 0.0858 Not 0.101761 0.102 Not 0.123201 0.123 Not 0.142884 0.143 Not 0.16 0.160

  6. Oscillations • Time for 10 oscillations as long as the oscillations do not die away quickly. Repeat and average, time permitting. • Start your object oscillating with a small amplitude and start your stop watch at the end of an oscillation – not when first released! • Divide the average time for 10 oscillations by 10 to obtain the periodic time. • When recording a time from a stop watch you should only record it to the nearest tenth of a second – your reaction time will prevent it being any more accurate! Click to see how table should be completed Time for 10 0scillations / s 1 2 3 Average

  7. Circuits • Before setting your circuit up, place your components on your desk as they are in the circuit. • Starting at the source, connect your components wire at a time, leaving any parallel components, e.g. voltmeters, to the end. Click to see the order in which leads should be connected.

  8. Circuits • If you have to alter the circuit in any way it may be best to start the circuit again, rather than adding components to a complete circuit.

  9. What graph should I plot? • Circle the two variables • Write the equation so the variables are on opposite sides • Re-arrange the equation in the form of y = mx + c, where y and x are variables or functions of variables • Below are some of the experiments you need to know for module 1. Click to complete the table. S = ½ gt2 t2 S ½ g 0 (E) 0 stress = E x strain Stress Strain R = (/A)l R l (length) /A 0 V = - rI + E V I -r E Note: the graphs stated above are not the only graphs that could be used to determine the constants!

  10. What else? See your Practical Booklet for everything you need to know!

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