A-Level/JC Physics Tuition Singapore/H2 Physics Tuition/JC Physics Tutor

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A-Level Physics Tuition Singapore/H2 Physics Tuition/JC Physics Tutor

Topic 1: Measurement Part 1

1.What are systematic / random errors? How can they be eliminated?

Systematic Errors

Errors of measurement which result in all readings being consistent overestimates or underestimates of its true value.

Cannot be reduced by taking repeated readings.

Can be reduced or eliminated by careful experimental design or good experimental techniques.

Examples: apparatus (zero errors, poor calibration), poor experimental technique (consistent parallax error), external factors (air resistance, background radioactive count rate).

Small systematic errors mean good accuracy.

Random Errors

Errors of measurement which cause an unpredictable scatter of readings about a mean value.

Can be reduced by taking repeated readings and finding the average

Cannot be eliminated.

Examples: Inconsistent reaction time, random parallax error, environmental conditions (fluctuations in measurement), limited sensitivity of instruments.

Small random errors mean good precision.

Please contact Angie @ 96790479 or Mr Ong @ 98639633 if you need help in Physics

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A-Level Physics Tuition Singapore/H2 Physics Tuition/JC Physics Tutor

Topic 1: Measurement Part 2

Distinguish between precision and accuracy.

Accuracy

Small systematic errors mean good accuracy.

A set of accurate readings is one where the readings are close to the actual value.

Precision

Small random errors mean good precision.

A set of precise readings is one that has a small spread or scatter of readings.

Please contact Angie @ 96790479 or Mr Ong @ 98639633 if you need help in Physics

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A-Level Physics Tuition Singapore/H2 Physics Tuition/JC Physics Tutor

Topic 2: Kinematics Part 1

1. Define displacement, speed, velocity and acceleration.

Displacement – The linear / shortest distance in a given direction from a
reference point.

Speed – The rate of change of distance.

Velocity – The rate of change of displacement.

Acceleration – The rate of change of velocity.

Please contact Angie @ 96790479 or Mr Ong @ 98639633 if you need help in Physics

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A-Level Physics Tuition Singapore/H2 Physics Tuition/JC Physics Tutor

Topic 2: Kinematics Part 2

2. Derive the 4 kinematics equations which represent uniformly accelerated
motion in a straight line.

3. Describe qualitatively the motion of bodies falling in a uniform gravitational field with air resistance.

4. Explain why, for all real throws, the time taken to reach the maximum height must be shorter than the time taken to return to the starting point.

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JC1 Promo Exams and JC2 Prelim Exams Preparatory Classes

for Physics.

Open for Registration Now!

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A-Level Physics Tuition Singapore/H2 Physics Tuition/JC Physics Tutor

Hi A-level/H2/JC Physics Tuition students

Attache A Level H2 Physics (9646) Paper 1 Answers

Please contact me @ 98639633 if your answers is different from mine

1 A 11 B 21 C 31 B
2 D 12 A 22 D 32 D
3 C 13 D 23 B 33 B
4 A 14 A 24 B 34 C
5 C 15 A 25 A 35 C

6 A 16 A 26 B 36 C
7 D 17 C 27 B 37 C
8 C 18 A 28 B 38 A
9 A 19 C 29 D 39 D
10 C 20 B 30 B 40 B

Mr Ong SH – A Level/JC/H2 Physics Tutor

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A-Level Physics Tuition Singapore/H2 Physics Tuition/JC Physics Tutor

Physics Tuition Center Singapore

Water is pumped through a hosepipe at a rate of 90 kg per minute. It emerges from the hosepipe horizontally with a speed of 20 m s–1.

Which force is required from a person holding the hosepipe to prevent it moving backwards?

A 30 N
B 270 N
C 1800 N
D 10800 N

Answer

A
90 kg min-1 = 1.5 kg s-1
F = d(mv)/t
= v dm/t
= 20*1.5
= 30 N

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