1A a (i)
Few people asked me to check your circuits
a (ii)
Accurate to the precision of the meter, units!
a(iii)
Observations!!! Wording! Series circuit, one bulb
not working implies all not working!
A(iv)
A(iv)
Readings to resolution of voltmeters
Understanding of series circuits... Current the
same everywhere...
b (i) Multiple readings, average, units, reading a
stopclock
(ii) OK
(iii)
Mass grams versus kilograms (Base units)
How to approach numerical problems....
UNITS!
1. Write down what you know, what you need to find
2. Convert any values to base values (5g => 0.005kg)
3. State equations used in their original form
4. Rearrange if required
5. Substitute numbers in
6. Calculate answer
7. Give answer and units
8. Underline/highlight
(iv)
Diagram / Practical approach... Ensuring that the
vertical measurement is consistent... measure to
the same point
Ruler readings accurate to mm
Use of supplied equipment, set square
Taking readings, eye-level, parallax
Mgh calculations..... Base units, workings and
units
(v)
Ratio ok... Interesting some people fixed earlier
cocked up K.E. Calculations!
% difference... Weak
1B
(a) Using a ruler... Avoiding zero problems...
Precision to mm
Length versus extension... There was a hint in the
question
(b)
Graphs were generally ok... Avoid join the dots
and take care when crossing out etc
Show how you read off of the graph for the
subsequent calibration question
(c)
Many used set square against retort stand (may
not be vertical), then again table may not be
horizontal either (marks given). Values accurate to
mm
(d) tan calc....
Wrong numbers, take care!
Units!!!!
(e) Where attempted, generally OK.. Good idea to
show where you read off of the graph
(f) Wrong numbers for calculations, diving in!!
More working....
Mass versus weight (easy mistake, learn from it)
(g) Only question which requires any thought.....
But many of the easy marks were obvious from
the question and were thrown away....
Read the question!!!!
Half marks on this one is probably ok if we get all
the easy marks and avoid silly mistoooks
Units!
Be careful when using non base units (m, k, s)
Approach numerical problems in a sensible
fashion
Take care to substitute the correct numbers (Draw
a diagram)
Multiple readings and average
Be observant for observations