Cambridge O Level

[Pages:20]*1756474749*

Cambridge O Level

PHYSICS Paper 2 Theory

You must answer on the question paper. No additional materials are needed.

5054/22 May/June 2021 1 hour 45 minutes

INSTRUCTIONS Section A: answer all questions. Section B: answer two questions. Use a black or dark blue pen. You may use an HB pencil for any diagrams or graphs. Write your name, centre number and candidate number in the boxes at the top of the page. Write your answer to each question in the space provided. Do not use an erasable pen or correction fluid. Do not write on any bar codes. You may use a calculator. You should show all your working and use appropriate units.

INFORMATION The total mark for this paper is 75. The number of marks for each question or part question is shown in brackets [ ].

DC (MB/FC) 205096/3 ? UCLES 2021

This document has 20 pages.

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2 Section A Answer all the questions in this section. Answer in the spaces provided.

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

...........................................................................................................................................

...........................................................................................................................................

..................................................................................................................................... [1]

(ii) State two examples of each type of quantity. scalar quantity

vector quantity

1 ...................................................... 1 ......................................................

2 ...................................................... 2 ...................................................... [2]

(b) Fig. 1.1 shows the direction and size of two vectors P and Q.

P

Q

Fig. 1.1 In the space next to Fig. 1.1, draw a labelled vector diagram to show the resultant vector obtained by adding vector P to vector Q. Draw vector P, vector Q and the resultant vector to the same scale as in Fig. 1.1.

[2] [Total: 5]

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3 2 A car approaches a set of traffic lights. The lights change to red at time t = 0.

Fig. 2.1 shows how the speed of the car changes with time. 24

speed 20 m / s 16

12

8

4

0 012345678 t / s

Fig. 2.1 (a) The car starts to slow down a short time after the lights change to red.

Determine the time between the lights changing to red and the car starting to slow down. ............................................................................................................................................. [1] (b) (i) State what is meant by uniform acceleration.

........................................................................................................................................... ..................................................................................................................................... [1] (ii) State how Fig. 2.1 shows that the deceleration of the car between t = 2 s and t = 7 s is non-uniform. ........................................................................................................................................... ..................................................................................................................................... [1] (c) Determine the distance the car travels from the moment the car starts to slow down until it stops.

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distance = ......................................................... [3]

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[Total: 6] [Turn over

4 3 Fig. 3.1 shows a small brick hanging from a newton meter.

newton meter

brick

Fig. 3.1 The reading on the newton meter is 3.0 N. (a) Describe how the reading on the newton meter is used to find the mass of the brick.

................................................................................................................................................... ............................................................................................................................................. [1] (b) The same brick and newton meter are used in the apparatus shown in Fig. 3.2. The meter rule is pivoted at its centre and is balanced. The reading on the newton meter is not shown.

newton meter

0

1

2

3

4

5

10 cm

20 cm

pivot

uniform metre rule

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Fig. 3.2

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5 (i) State the principle of moments for a body in equilibrium.

........................................................................................................................................... ........................................................................................................................................... ..................................................................................................................................... [1] (ii) Determine the reading on the newton meter shown in Fig. 3.2.

reading = ......................................................... [2]

(c) A beaker of water is placed so that the brick is partly submerged in the water, as shown in Fig. 3.3. The apparatus is adjusted to keep the rule horizontal.

newton meter

0

1

2

3

4

5

10 cm

20 cm

pivot

uniform metre rule

water

Fig. 3.3 Suggest why the reading on the newton meter is less than your answer in (b)(ii). ................................................................................................................................................... ................................................................................................................................................... ............................................................................................................................................. [2]

[Total: 6]

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6 4 (a) In a demonstration, a teacher uses a loud ticking clock, two hollow tubes A and B, a barrier

and a smooth surface. The clock is used as a source of sound. Fig. 4.1 shows tube A and the clock, both fixed in position on the left of the barrier.

smooth surface

hollow tube A

ticking clock

barrier Fig. 4.1

hollow tube B ear

Sound from the ticking clock passes along tube A and is incident on the smooth surface. A student listens to the sound passing along tube B, which is on the right of the barrier. (i) On Fig. 4.1, draw tube B in the position where the sound heard by the student is loudest.

[1] (ii) Explain your answer to (i).

........................................................................................................................................... ........................................................................................................................................... ..................................................................................................................................... [2] (b) The speed of sound in air is 330 m / s. State a typical value for the speed of sound in a solid. ............................................................................................................................................. [1]

[Total: 4]

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7

Question 5 begins over the page

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8

5 Fig. 5.1 shows a method of producing sandpaper using static electricity.

glue paper

sand

negative metal plate

sand

positive metal plate

Fig. 5.1

Glue is sprayed on to moving paper. The sticky paper then passes between two metal plates.

One of the plates is positive and the other plate is negative.

There is an electric field between the plates.

(a) On Fig. 5.2, draw the electric field between the two metal plates. Show the direction of the electric field.

negative metal plate

positive metal plate

Fig. 5.2 [2]

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