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AS Physics Practical - Paper 34
- Thread starter UziB
- Start date
- Messages
- 141
- Reaction score
- 107
- Points
- 38
thats nice
- Messages
- 26
- Reaction score
- 15
- Points
- 3
Scared of CIE guys ?
Hab keine Angst davor. I just hope I don't make some silly mistakes.
actually mainly of practicals and after this chill sceneScared of CIE guys ?
- Messages
- 141
- Reaction score
- 107
- Points
- 38
- Messages
- 37
- Reaction score
- 6
- Points
- 8
U r really fast hahadont know someone posted here that question related to heat is coming so i performed this one in my house
- Messages
- 8
- Reaction score
- 23
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- 23
do check out these questions.
s08/qp32/q1
w10/qp34/q2
s08/qp32/q1
w10/qp34/q2
- Messages
- 37
- Reaction score
- 6
- Points
- 8
I think u r geek so dont drink books. But get through the contents and what it means.this is the third time iam repeating physics practical th first tym is scored a D in may june 12 /in oct nov i scored a C i dont know why i almost alyways score A or B in mocks or midterm what shall i do
I got failed in all the terminal exams of entire college. But i get best grade in CIE.
So be cool.
- Messages
- 8
- Reaction score
- 23
- Points
- 23
and to help u guys for tomorrows paper here are some tips.
Oscillations
* Perform 3 sets of measurements for each different oscillation, (you will get more marks if you do 2 sets of repeats).
* Measure at least 30 periods in total.
* Preferably make each measurement 20 periods long.
* Precaution: minimize oscillations in any other plane other than the one being observed
* Always write times to two d.p., never to the nearest second.
* Precaution: do small amplitude oscillations
* Precaution: say that you did several periods at once to minimize reaction time errors.
Moments
* Precaution: balance the ruler being used first.
* Use distances from the pivot of greater than 25 cm (250 mm).
* Weigh the unknown and known masses in your hands before using the ruler, and place the lighter mass as far from the pivot as possible.
* Measure distances from the pivot to the centre of mass of the object.
* All measurements should be to 1 mm accuracy.
* To make sure the rule is balanced, pull each end down. If it comes up again then the rule must have equal moments acting on it on either end.
Density Measurements
* When using a micrometer, one full rotation of the barrel is 0.5 mm (50 on the barrel scale).
* The micrometer reads to 0.01 mm accuracy.
* Vernier calipers can read to 0.05 mm accuracy. However, it is advisable to quote the figure to 0.1 mm accuracy, as this will give a larger uncertainty, which will make comparisons in later parts of the question easier.
* If measuring a very small dimension, measure several "thicknesses" of it. Remember to divide by the number of thicknesses after the measurement!
* Precaution: check the zero error on the micrometer and/or Vernier calipers. Wipe the jaws of the micrometer to remove grease.
* Give answers to 2 or 3 s.f. : it is meaningless to write, for example, "density is 7785.654 kg m-3"!
* Always take at least 3 readings for each measurement, and take an average.
* When measuring string diameters or foil thicknesses (or similar), use a minimum of 10 thicknesses.
Uncertainties
* % Uncertainty =
* When multiplying or dividing quantities, add their % uncertainties together.
* When adding or subtracting quantities, add their absolute errors together, then divide by the result of the addition/subtraction of the measurement, e.g. for , where , and , the absolute errors added = 0.102 mm. Therefore the % uncertainty is:
* If you have to calculate the error in, e.g. , the absolute error in d must be multiplied by pi and then added to the absolute error in x. The percentage uncertainty is this total error divided by the calculated and the result multiplied by 100.
* If a measurement is to be raised to a power, then multiply the % uncertainty in the measurement by the power to get the % uncertainty in the overall term.
* If two values, for say, a density are available, calculate the % difference between them. If a value is given by the examiner, then use this as the "correct" value, and calculate the % difference the following way: where x is your measured value, and c is the examiner's value. If you have obtained two values, then the expression changes: where x1 and x2 are your measured values, and is the median of the two, (not necessarily the mean!).
* Compare the % difference with your % uncertainty. Any relationship suggested, such as that the two densities should be equal, can be considered correct if your % difference is less than your % uncertainty. This will gain you marks!
* If your % uncertainties look small, check that you have multiplied by 100!
Graphs
* With any graph, a minimum of 6 to 8 points are needed, and you must have at least 4 points on a curve.
* When measuring the gradient of a graph, carry your tangent on to the sides of the graph paper, however big your graph. The triangle you use should be greater than 10 cm in length and height, although in some mark schemes 100 cm2 is fine.
* Your graph does not have to go through the origin. If the data does not indicate that it does so, do not force it to. Comment on the fact that there must have been a systematic error.
* When choosing values to read of a graph, it is better to take them from the middle part of the curve, as this is where you will have more points per change in y co-ordinate.
* When describing your "plan" in Experiment C, state that the graph you plot will be a straight line through the origin (if this is the case!), of gradient = to an expression which will help you confirm the relationship suggested by the examiner.
* Turning points on graphs require at least 4 points.
* If points near the origin deviate substantially from your line of best fit, point out that for small measurements there is a greater uncertainty.
Experiments Involving Temperature
* Readings should be accurate to fractions of a degree.
* Stir any liquid being heated.
* Insulate the apparatus if possible.
* The thermometer should not be touching the sides of the container it is in, and should be in the middle of the liquid you are measuring the temperature of.
* Precaution: read the thermometer at eye level to avoid parallax error.
* The bulb of the thermometer should be completely submerged.
* Comment on the result obtained being the right order of magnitude.
Oscillations
* Perform 3 sets of measurements for each different oscillation, (you will get more marks if you do 2 sets of repeats).
* Measure at least 30 periods in total.
* Preferably make each measurement 20 periods long.
* Precaution: minimize oscillations in any other plane other than the one being observed
* Always write times to two d.p., never to the nearest second.
* Precaution: do small amplitude oscillations
* Precaution: say that you did several periods at once to minimize reaction time errors.
Moments
* Precaution: balance the ruler being used first.
* Use distances from the pivot of greater than 25 cm (250 mm).
* Weigh the unknown and known masses in your hands before using the ruler, and place the lighter mass as far from the pivot as possible.
* Measure distances from the pivot to the centre of mass of the object.
* All measurements should be to 1 mm accuracy.
* To make sure the rule is balanced, pull each end down. If it comes up again then the rule must have equal moments acting on it on either end.
Density Measurements
* When using a micrometer, one full rotation of the barrel is 0.5 mm (50 on the barrel scale).
* The micrometer reads to 0.01 mm accuracy.
* Vernier calipers can read to 0.05 mm accuracy. However, it is advisable to quote the figure to 0.1 mm accuracy, as this will give a larger uncertainty, which will make comparisons in later parts of the question easier.
* If measuring a very small dimension, measure several "thicknesses" of it. Remember to divide by the number of thicknesses after the measurement!
* Precaution: check the zero error on the micrometer and/or Vernier calipers. Wipe the jaws of the micrometer to remove grease.
* Give answers to 2 or 3 s.f. : it is meaningless to write, for example, "density is 7785.654 kg m-3"!
* Always take at least 3 readings for each measurement, and take an average.
* When measuring string diameters or foil thicknesses (or similar), use a minimum of 10 thicknesses.
Uncertainties
* % Uncertainty =
* When multiplying or dividing quantities, add their % uncertainties together.
* When adding or subtracting quantities, add their absolute errors together, then divide by the result of the addition/subtraction of the measurement, e.g. for , where , and , the absolute errors added = 0.102 mm. Therefore the % uncertainty is:
* If you have to calculate the error in, e.g. , the absolute error in d must be multiplied by pi and then added to the absolute error in x. The percentage uncertainty is this total error divided by the calculated and the result multiplied by 100.
* If a measurement is to be raised to a power, then multiply the % uncertainty in the measurement by the power to get the % uncertainty in the overall term.
* If two values, for say, a density are available, calculate the % difference between them. If a value is given by the examiner, then use this as the "correct" value, and calculate the % difference the following way: where x is your measured value, and c is the examiner's value. If you have obtained two values, then the expression changes: where x1 and x2 are your measured values, and is the median of the two, (not necessarily the mean!).
* Compare the % difference with your % uncertainty. Any relationship suggested, such as that the two densities should be equal, can be considered correct if your % difference is less than your % uncertainty. This will gain you marks!
* If your % uncertainties look small, check that you have multiplied by 100!
Graphs
* With any graph, a minimum of 6 to 8 points are needed, and you must have at least 4 points on a curve.
* When measuring the gradient of a graph, carry your tangent on to the sides of the graph paper, however big your graph. The triangle you use should be greater than 10 cm in length and height, although in some mark schemes 100 cm2 is fine.
* Your graph does not have to go through the origin. If the data does not indicate that it does so, do not force it to. Comment on the fact that there must have been a systematic error.
* When choosing values to read of a graph, it is better to take them from the middle part of the curve, as this is where you will have more points per change in y co-ordinate.
* When describing your "plan" in Experiment C, state that the graph you plot will be a straight line through the origin (if this is the case!), of gradient = to an expression which will help you confirm the relationship suggested by the examiner.
* Turning points on graphs require at least 4 points.
* If points near the origin deviate substantially from your line of best fit, point out that for small measurements there is a greater uncertainty.
Experiments Involving Temperature
* Readings should be accurate to fractions of a degree.
* Stir any liquid being heated.
* Insulate the apparatus if possible.
* The thermometer should not be touching the sides of the container it is in, and should be in the middle of the liquid you are measuring the temperature of.
* Precaution: read the thermometer at eye level to avoid parallax error.
* The bulb of the thermometer should be completely submerged.
* Comment on the result obtained being the right order of magnitude.
If anyone is appearing for the physics practical - paper 34 on the 30th then feel free to share some tips or guess papers you know
hahahahahahaha uzbaige kya chusen mar ra he idhar tu
(Toori)
- Messages
- 118
- Reaction score
- 62
- Points
- 38
talha thanks alot man you solved my problem. god bless you
http://papers.xtremepapers.com/CIE/...nd AS Level/Physics (9702)/9702_w08_qp_31.pdf Q1g how to find p can somebody explain plssss
http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Physics (9702)/9702_w08_qp_31.pdf Q1g how to find p can somebody explain plssss
p is the gradient~
it's like y = mx + c
- Messages
- 23
- Reaction score
- 3
- Points
- 3
in
inbox me too please
balancing a ruler =
practiced it lst monthprojectile no (neat 50 percent vector 40 percent 10 pendilum)
- Messages
- 37
- Reaction score
- 6
- Points
- 8
Are u really serious?
this is the third time iam repeating physics practical th first tym is scored a D in may june 12 /in oct nov i scored a C i dont know why i almost alyways score A or B in mocks or midterm what shall i do
The coming exam will use these:
Uniform wooden strip 均匀的木条
String 线
Stand 铁架台
Round nail 圆钉
Newton-meter 0.1N (0-10N) 牛顿力计
Mass hanger 质量挂钩
Modelling clay 粘土（橡皮泥）
Meter rule 1mm 米尺
Pivot 支点或支架
Spacing 间隔或空挡
Clamp 夹子
Flexible plastic tube 柔性塑料管
Scissor 剪刀
50ml plastic syringe 塑料注射器（50ml）
Nozzle 喷嘴
Plunger 活塞
2ml graduation 刻度（2ml）
Bowl 碗
Tray 托盘
Blu-tack 胶水
Vernier caliper 游标卡尺（0.1mm）
Beaker 烧杯
Jug 壶
Paper towel 纸巾
Stopwatch 秒表（0.1s）