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AS Level Physics SABZ > Practical Skills At AS-level > Flashcards

Practical Skills At AS-level Flashcards

Key 🗝 ideas 💡, definitions ND formulae

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1
Q

Name the 6 base(as level) quantities and their corresponding units

A
  1. Mass, unit: kilogram (Kg)
  2. Time, unit: seconds (s)
  3. Thermodynamic temperature, unit: Kelvin (K)
  4. Distance, unit: metres (m)
  5. Current, unit: Amperes (A)
  6. Amount of substance, unit : moles (mol)
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2
Q

Define derived units ?

A

Are a combination of base units

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3
Q

Definition of SI units :

A

They are carefully defined units that are used throughout the scientific world for measuring all quantities.

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4
Q

Definition of base quantities :

A

Are the fundamental quantities whose units are used to derive to derive all other units

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5
Q

Definition base units :

A

Are the units of base quantities. The fundamental units.

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6
Q

Homogeneity of equations refers to:

A

The units on both sides of the equation must be the same

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7
Q

What are the 10 sub - /multiples and their multiplying factor… Starting from smallest to biggest.

A

Pico (p) = 10^ - 12

Nano (n) =10^-9

Micro (u) =10 ^-6

Milli (m) =10 ^-3

Centi (c) =10 ^-2

Deci (d) =10 ^-1

Kilo(K) =10 ^3

Mega (M) =10 ^6

Giga (G) =10 ^9

Tera (T) =10 ^12

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8
Q

What are the two types of errors :

And an example of each

A
  1. Random e.g. Parallax error

2 systematic e.g. Zero error

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9
Q

There characteristics of random errors :

A
  1. Due to the observer
  2. Cannot be eliminated
  3. Can be reduced by e.g. Taking 5 or more readings and averaging or repeating the experiment to get more results
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10
Q

4 characteristics of systematic errors :

A
  1. Due to faulty equipment or apparatus
  2. this is constant ; it affects all measurements by the same magnitude
  3. It cannot be reduced but it can be eliminated by taking the equipment to the manufacturer
  4. With a systematic error your results can be precise but they will not be accurate
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11
Q

Definition of accuracy :

A

Refers to how close a measurement is to the true value

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12
Q

Definition of precision :

A

Refers to how the close the measurements are to each other (or how close they are to the range of measurements /values)

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13
Q

What does A and B stand for in the measured quantity :

A +- B

A

A= measured value

B= absolute uncertainty

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14
Q

Formula for percentage uncertainty =

A

(Absolute uncertainty /measured value) ×100

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15
Q

Formula for fractional uncertainty :

A

Absolute uncertainty /measured value

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16
Q

Formula for absolute uncertainty =

A

Fractional uncertainty × Calculated value

17
Q

The 3 rules of combining uncertainties:

A
  1. For similar quantities whether the quantities are added/subtracted from each other - their absolute uncertainties are always added (e.g. Cm and cm)
  2. For different quantities ; we have to add the fractional/percentage uncertainties
  3. When you calculate the uncertainty in a quantity that has a power ; you must multiple the percentage /fractional uncertainty of the quantity by its power
18
Q

3 things can be used to measure length :

A
  1. A metre rule
  2. vernier caliper (diameters in hollow tubes)
  3. Micrometre screw gauge
19
Q

What 2 things measure weight:

A
  1. Top pan balance

2. Spring balance

20
Q

What can be used to measure angles

A

Protractor

21
Q

What two things can be used to measure time intervals?

A
  1. A clock

2. Stopwatch

22
Q

What 2 things can be used to measure potential difference?

A
  1. Voltmetre

2. Cathode ray oscilloscope

23
Q

What can be used to measure time intervals and frequencies of waves?

A

A cathode ray oscilloscope with calibrated time base

24
Q

What can be used to measure temperature?

A

A thermometer

25
Q

What can be used to measure current?

A

Ammeter

26
Q

Rulers measure to the nearest…

A

Millimetre

27
Q

Vernier calipers measure to the nearest

A

0.1 mm

28
Q

Micrometres measure to the nearest

A

0.01 mm

29
Q

vernier calipers have what 2 scales?

A
  1. A main scale measures in mm

2. A vernier scale measure in 0.1mm

30
Q

Read pg 15 on physics revision guide to understanding how a micrometre screw gauge works

A

…

AS Level Physics SABZ (17 decks)

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