WA1 Practice Paper: Weighted Assessment 1 — question paper (print)

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Secondary 3 · Physics (G2 / G3)

WA1 Practice Paper

Weighted Assessment 1

Duration: 55 minutes

Total: 40 marks

Name:

Class:

Date:

READ THESE INSTRUCTIONS FIRST

Write your name, class and register number in the spaces at the top of this page.
Answer all questions.
Give numerical answers correct to 3 significant figures unless stated otherwise, with units where a quantity is calculated. Take g = 10 N/kg.
The number of marks is given in brackets [ ] at the end of each question or part question.
The total number of marks for this paper is 40.

Original practice material written for the MOE Physics syllabus. It is not an official MOE or school examination paper. Chapters 1–3 (physical quantities, units and measurement; kinematics; dynamics).

For Examiner’s Use
Section A	/ 10
Section B	/ 30
Total	/ 40

Section A: Multiple-choice questions[10 marks]

Answer all questions. For each question, write the letter (A, B, C or D) of the correct answer.

1
Which of the following is a base quantity?
1. Aforce
2. Blength
3. Cpressure
4. Denergy
( )
2
A wire has a diameter of 25 mm. In metres this is
1. A0.0025 m
2. B0.025 m
3. C0.25 m
4. D250 m
( )
3
Which quantity is a scalar?
1. Adistance
2. Bdisplacement
3. Cvelocity
4. Dacceleration
( )
4
The instrument that measures the diameter of a wire to the nearest 0.01 mm is the
1. Ametre rule
2. Bvernier calipers
3. Cmeasuring tape
4. Dmicrometer screw gauge
( )
5
The area under a speed–time graph gives
1. Aacceleration
2. Bdistance travelled
3. Caverage speed
4. Dresultant force
( )
6
A ball falls from rest for 3.0 s. Taking g = 10 m/s², its speed at that instant is
1. A30 m/s
2. B3.3 m/s
3. C10 m/s
4. D90 m/s
( )
7
Action and reaction forces (Newton’s third law) act on
1. Athe same body, in the same direction
2. Bthe same body, in opposite directions
3. Cdifferent bodies, in opposite directions
4. Ddifferent bodies, in the same direction
( )
8
Two forces of 6.0 N and 8.0 N act at right angles to each other. The magnitude of their resultant is
1. A2.0 N
2. B7.0 N
3. C14 N
4. D10 N
( )
9
A skydiver falls at terminal velocity. The resultant force on the skydiver is
1. Azero, so the acceleration is zero
2. Bdownwards, so the skydiver still speeds up
3. Cequal to the skydiver’s weight, downwards
4. Dupwards, so the skydiver slows down
( )
10
The inertia of a body depends on its
1. Aweight
2. Bvolume
3. Cmass
4. Dspeed
( )

Section B: Structured questions[30 marks]

Answer all questions in the spaces provided.

1
A student investigates a simple pendulum. The student times 20 complete oscillations and the stopwatch reads 36.0 s.
1. (a)
  Name the instrument that measures the diameter of the pendulum bob to the nearest 0.01 mm.
  [1]
2. (b)
  Calculate the period of the pendulum.
  period =s[2]
3. (c)
  Explain why the student times 20 oscillations rather than a single oscillation.
  [2]
4. (d)
  State two precautions that make the measurement of the period more accurate.
  [2]
2
A car starts from rest and accelerates uniformly at 4.0 m/s² for 6.0 s. It then travels at a constant speed for a further 10 s.
1. (a)
  Calculate the speed of the car after the first 6.0 s.
  speed =m/s[2]
2. (b)
  Calculate the distance travelled during the first 6.0 s.
  distance =m[2]
3. (c)
  Calculate the distance travelled during the next 10 s.
  distance =m[1]
4. (d)
  Calculate the total distance travelled in the 16 s journey.
  total distance =m[2]
5. (e)
  Calculate the average speed for the whole journey.
  average speed =m/s[1]
3
A car of mass 1200 kg travels along a level road. The driving force is 2400 N and the total friction is 600 N.
1. (a)
  Calculate the resultant force on the car.
  resultant force =N[1]
2. (b)
  Calculate the acceleration of the car.
  acceleration =m/s²[2]
3. (c)
  The car starts from rest. Calculate its speed after 8.0 s.
  speed =m/s[2]
4. (d)
  The driver switches off the engine, leaving only the 600 N friction acting. Calculate the new acceleration of the car and state its direction relative to the motion.
  [3]
4
An astronaut has a mass of 60 kg. Take g on Earth as 10 N/kg and g on the Moon as 1.6 N/kg.
1. (a)
  Calculate the astronaut’s weight on Earth.
  weight =N[2]
2. (b)
  State the astronaut’s mass on the Moon.
  mass =kg[1]
3. (c)
  Calculate the astronaut’s weight on the Moon.
  weight =N[2]
4. (d)
  Explain why the mass stays the same but the weight changes.
  [2]

— End of paper —