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MADHARASATHUL AHMADHIYYAFirst Term Examination

GRADE 8

PHYSICS 5054

Paper 2 Theory

May 2009

Index Register

Class number number

Name: .

TIME 1 hours

INSTRUCTIONS TO CANDIDATES

Write your name, class, index number and register number in the spaces provided.

Write in blue or black pen

You may use a soft pencil for any diagrams, graphs.

Section A

Answer all questions

Write your answers in the space provided on the question paper

Section B

Answer any two questions

Write your answers in the space provided on the question paper

The number of marks is given in brackets at the end of each question or part questions

Madharasathul Ahmadhiyya

First Term Examination 2009

This question paper consists of 9 printed pages.

[Turn over]

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Part A

1. In what unit are the following measured? [3]

a. Force:

b. Mass:

c. Weight:

2. Name the instrument that can be used to measure; [3]

a. Length; .........

b. Force /weight;

c. Time; .

3. Define the following quantities [4]

a. Volume

b. Uniform acceleration

4. Describe the differences between the motion of the molecules of ice water, and steam. [3]

..

..

5. Cars rely on friction for their forward motion. The diagram shows one of the forces that act

when a car is travelling at a steady speed. [3]

a. What is the correct name of the force X shown?

..

b. Give two advantage of force X

..

..

Direction of motion

X

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6. An empty beaker has a mass of 80g. When it is partly filled with oil its mass is 224g. A

student used measuring cylinders which can measure a maximum to empty the

beaker.

The student gets two completely full cylinders and a half cylinder of oil while emptying the

beaker.

a. Find the mass of the oil in the beaker? [2]

b. What is the volume of oil taken from the beaker? [2]

c. Calculate the density of the oil

i. [2]

ii. [2]

The density of gold is 19.6 g/cm3. What does it mean? [2]

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7. a. How is velocity different from speed [2]

..

b. A motorcycle starts from rest and accelerates steadily until it is travelling at 18km/h

i. Find the speed in m/s [3]

ii. If it takes 10 seconds to attain this speed, what is its acceleration? [3]

..

..

8. A space craft travels from earth to Mars, where the gravitational field strength near the

surface is 3.7N/kg. The space craft is carrying a probe which has a mass of 150kg when

measured on Earth.

a. What is the probes weight on Earth? [1]

b. What is the probes mass in space? [1]

c. What is the probes mass on Mars? [2]

d. What is the probes weight on Mars? [2]

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e. When the probe is falling, near the surface of Mars, What is its acceleration? [2]

..

9. a. Define force and mention two types of forces [3]

.

b. A concrete block measuring 0.1m by 0.4m by 1.5m has a mass of 30kg.

i. Calculate the weight of the block [2]

...

ii. Draw a diagram to show how the block must rest to exert the maximum pressure

on the ground. Calculate this pressure [4]

10. The following reading is the result of spring stretching experiment.

Stretching force /N Extension /mm

0

1

2

3

5

0

10

30

40

58

a. Fill the blanks in the table [2]

b. i. Plot a graph of extension against stretching force [4]

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ii. Mark the elastic limit on the graph. [1]

iii. What stretching force is needed to produce an extension of 25 mm? [1]

..

iv. What would have been the effect on the length of the spring on unloading it when a

force of 2.5N had been reached [1]

....

..

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Part B

Answer any two questions

1. An object falls down on to a friction free horizontal surface in the way shown in the figure.

The ball took 0.5 s to roll from one position to the next.

For example it rolled from A to B in 0.5 s and from B to C in 0.5 s and so on

a. Write down

i. The distance traveled by the ball from A to E. [1]

ii. The time taken by the ball to reach E. [1]

b i. Write down in words the equation connecting speed ,distance and time. [1]

ii. Calculate the average speed of the ball rolling from A to E. [2]

c i. Explain the motion of the ball while rolling on the slop [2]

d. A bus driver takes a total of three hours to make a journey of 90 km. He has a tea break

of half an hour and spends a quarter of an hour in a traffic jam.

At what average speed must she travel during the rest of the time if she wants to complete

the journey in the three hours? Give your answer in km/h [3]

.

E

BC

D

A

10m

5m

0

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2. The figure shows a tyre used on a large vehicle.

a. When the vehicle is loaded, the area of contact with the ground is a rectangle of sides

1.0 m and 0.5 m.

i. Calculate the area of contact of one tyre with the ground in m2 [2]

ii. The vehicle has four such tyres. Calculate the total area of contact with the ground in

m2. [2]

b.

i. Write down in words the equation connecting pressure, force and area. [1]

ii. When the vehicle is loaded, it weighs 100 000 N. Calculate the pressure in N/m2

exerted on the ground by the tyres. [3]

.

iii. What will be the pressure exerted in N/m2 by the tyres if 5000 N weight is unloaded

from the vehicle? [2]

http://images.google.mv/imgres?imgurl=http://i.ehow.com/images/GlobalPhoto/Articles/4600920/tires-main_Full.jpg&imgrefurl=http://www.ehow.com/how_2031567_have-colors-affect.html&usg=__Y7qLWEFQXDzuJWMSTs69VsDi5wo=&h=579&w=450&sz=34&hl=en&start=1&um=1&tbnid=AwDzzDW0mqNe2M:&tbnh=134&tbnw=104&prev=/images?q=vehicle+tires&hl=en&sa=N&um=1

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3.

a. Define density and state the SI unit in which it is measured. [2]

..

b. Describe, in detail, an experiment to measure the density of a liquid [5]

.

.

.

c. A block of stone measures 8cm by 5cm by 2cm and has a density of

i. What is the volume of the stone [1]

ii. What is the mass of the stone? [2]

**************************

GOOD LUCK