[Turn over Page 1 of 12

PHYSICS

SECONDARY 3 LEVEL TEST 1

6 Mar 2014 (Thursday) 1 hour CANDIDATE NAME

CLASS INDEX NUMBER

INSTRUCTIONS TO CANDIDATES Do not turn over the page until you are told to do so. Write your name, class and index number in the spaces above. Section A Write your name, class, and index number in the spaces in the boxes provided. There are ten questions in this section. Answer all questions. For each question there are four possible answers A, B, C and D. Choose the one you consider correct and record your choice in boxes provided on page 2. Any rough working should be done in this question paper. Sections B and C Answer all the questions. Show all your working and answers in the spaces provided on the question paper. Express your answers to 3 significant figures. INFORMATION FOR CANDIDATES The number of marks is given in brackets [ ] at the end of each question or part question. The total marks for this paper is 45. Approved electronic calculators are allowed in this paper.

This Paper consists of 12 printed pages including the cover page.

Section B

Section C

Total

45

For Examiners Use Section A

[Turn over Page 2 of 12

Section A: Multiple-choice Questions (10 marks)

Question 1 2 3 4 5 6 7 8 9 10

Answer

1 Which list of SI units contains only base units? A kelvin, metre, mole, ampere, kilogram B kilogram, metre, second, ohm C kilogram, newton, metre, ampere, ohm D newton, kelvin, second, volt, mole

2 In an experiment, the width w and the thickness x of a metre rule are to be measured as precisely as possible using normal laboratory apparatus.

Which combination of instruments is most appropriate for these

measurements?

Measurement of w Measurement of x A half-metre rule half-metre rule B half-metre rule vernier calipers C vernier calipers half-metre rule D vernier calipers micrometer screw gauge

[Turn over Page 3 of 12

3 A student pulls a piece of tape through a ticker-tape timer. Every 0.02 s, the timer prints a dot on the tape.

First the tape is pulled quickly, then slowly, then quickly again.

Which piece of tape does the student obtain?

4 The speed-time graph below shows the movement of a car.

What does the shaded area of the graph represent?

A The average acceleration of the car. B The average speed of the car. C The total distance travelled by the car. D The total travelling time of the car.

[Turn over Page 4 of 12

5 An aircraft, flying at a constant height, is gaining speed. The four forces acting are

L lift due to the wings R air resistance T the thrust due to the engines W the weight

Which of the following statements is correct?

Vertical forces horizontal forces

A L = W T = R B L > W T > R C L = W T > R D L > W T = R 6 A box of mass 8.0 kg rests on a horizontal, rough surface. A string attached to

the box passes over a smooth pulley and supports a 2.0 kg mass at its other

end.

When the box is released, a friction force of 6.0 N acts on it. What is the

acceleration of the box?

A 1.4 m s-2 B 1.7 m s-2 C 2.0 m s-2 D 2.5 m s-2

[Turn over Page 5 of 12

7 The propeller on a boat pushes water backwards with a force of 2000 N. The boat moves through the water against a total resistive force of 1800 N.

According to Newtons third law, what is the forward force on the propeller due

to the water?

A 3800 N B 2000 N C 1800 N D 200 N 8 A wooden block is pushed across a table at constant speed.

Which statement is correct?

. A The frictional force increases as the block moves at constant speed. B The frictional force is equal and opposite to the pushing force. C The frictional force is greater than the pushing force. D The frictional force is less than the pushing force. 9 The inertia of a body is its resistance to changes in motion. Which property is a measure of the bodys inertia?

A Its density B The height of its sides C Its mass D The size of its base

10 An object of mass 100 g is immersed in water in a cylinder. The water level rises from 50 cm3 to 90 cm3. What is the density of the material from which the

object is made?

A 0.4 g cm-3 B 1.1 g cm-3 C 0.9 g cm-3 D 2.5 g cm-3

[Turn over Page 6 of 12

Section B: Structured Questions (25 marks) Answer all the questions in the space provided.

1 (a) State the difference between a scalar quantity and a vector quantity.

.. [1]

(b) When two forces are combined, the size of the resultant force depends on the angle between the two forces.

A force of 6 N is added to another force of 8 N at right angles to each

other. Determine the resultant of the two vectors using vector diagrams.

Scale: 1 cm to 1 N

Resultant magnitude = .

Resultant direction = [3]

[Total: 4 marks]

[Turn over Page 7 of 12

2 A micrometer is used to measure the thickness of a sheet of glass. With the jaws closed and with no glass sheet, the micrometer reading is shown in Figure 2.1. With the jaws closed around the glass sheet, the micrometer reading is shown in Figure 2.2.

Figure 2.1 Figure 2.2

(a) State the smallest division of the thimble scale.

.. [1]

(b) State the zero error of the micrometer screw gauge.

.. [1]

(c) State the measurement of the micrometer screw gauge in Figure 2.2.

.. [1]

(d) State the corrected measurement of the thickness of the glass.

.. [1]

[Total: 4 marks]

[Turn over Page 8 of 12

3 A ball falls vertically, hits a table and rebounds vertically upwards. Figure 3 shows the velocity-time graph for the ball.

Figure 3

The ball is released at A, hits the floor at B and is in contact with the floor between B and C. D is the highest point reached as the ball rises.

(a) Using information from Figure 3, describe the motion of the ball between A and B.

.. [1]

(b) State how Figure 3 shows that the distance covered between A and B is larger than the distance covered between C and D.

.. [1]

(c) (i) Determine the change in speed of the ball between B and C.

[1]

(ii) Determine the change in velocity of the ball between B and C.

[1]

(iii) Hence, determine the acceleration of the ball between B and C.

[1]

[Total: 5 marks]

[Turn over Page 9 of 12

4 A picture weighing 10.0 N hangs freely by a cord XYZ as shown in Figure 4.1 below.

Figure 4.1 Figure 4.2

Construct separate free body diagrams for the nail and the frame separately on

Figure 4.2. [2] Show, using suitable scale diagrams in the space below, how the tension in the

cord is determined.

Scale: 1 cm to 2 N.

Tension in the cord: N. [3]

[Total: 5 marks]

[Turn over Page 10 of 12

5 (a) Define the mass of a body and its weight.

Mass ..

..

Weight ...

......[2]

(b) Figure 5.1 shows a persons weight is 800 N when he is in a stationary lift. Figure 5.2 shows the person in an ascending lift travelling with an acceleration of 2 m s-2 upwards.

Figure 5.1 Figure 5.2 Figure 5.3 (i) Draw a free body diagram of the forces acting on the person in

Figure 5.3 based on the ascending lift scenario. [2] (ii) Calculate the apparent weight of the person when he is in the

ascending lift.

Apparent weight: [3]

[Total: 7 marks]

[Turn over Page 11 of 12

Section C: Long Structured Question (10 marks) Answer the question in the spaces provided.

6 Figure 6.1 shows a parachutist falling vertically downwards. Figure 6.2 shows how the speed of the parachutist varies with time.

Figure 6.1 Figure 6.2

(a) (i) State the name of the downward force on the parachutist at A.

... [1]

(ii) State the acceleration of the parachutist (with units) at A.

... [1]

(iii) State the name of one upward force on the parachutist at B.

... [1]

(iv) Explain why the acceleration decreases from A to B.

.

.

... [2]

(v) Explain why the parachutist falls at a constant speed after B.

.

... [1]

[Turn over Page 12 of 12

(b) At point C, the parachutist deployed his parachute.

(i) Suggest why the parachutist falls at a lower speed after D.

... [1]

(ii) State the acceleration of the parachutist (with units) at D.

... [1]

(iii) Sketch the accelerationtime graph of the parachutist throughout his journey.

[2]

[Total: 10 marks]

THE END