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ST. DENIS SSEBUGWAWO S.S. GGABA

UGANDA ADVANCED CERTIFICATE OF EDUCATION

B.O.T TEST MAY 2012

SUBJECT : PHYSICS

PAPER : PAPER 1 (P510)CLASS : S.5

DATE :

TIME : DURATION : 2 HOURS

INSTRUCTIONS TO CANDIDATES

Attempt ALL questions,

Assume where necessary the following constants. Graph papers may be provided on request

;

;

;

;

.

,

SECTION A MECHANICS AND PROPERTIES OF MATTER

1. (a) (i) State Newton's first law of motion. (3 marks)

(ii) Explain with an example that a body at rest will remain at rest unless some

external force acts upon it to change its state of rest. (2 marks)

(b) Define the term inertia of rest. (1 mark)

(c) Explain the following observations by giving suitable reasons:

(i) A passenger in a bus tends to fall backward when it starts suddenly.

(3marks)

(ii) Dust can be removed from a hanging carpet by shaking it or by beating it

with a stick. (3marks)

(iii) A passenger in a moving bus tends to fall forward when it stops

suddenly. (3marks)

(iv) A person jumping out of a speeding bus may get seriously injured

(3marks)

(v) An athlete runs a certain distance before taking a long jump.(3marks)

2. (a) Distinguish between fundamental and derived physical quantities. Give two

examples of each (4mark)

(b) (i) distinguish between the terms velocity and acceleration (2mark)

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(ii) A ball is thrown vertically upwards with a velocity of from a

point above the ground. Describe, with the aid of a velocity-time

graph, the subsequent motion of the ball. (10mark)

(c) A boat crosses a river wide flowing at at to reach a point on the

opposite bankupstream, the boats speed in still water is . Find the

direction in which the boat must be headed. (4mark)

3. (a) (i) State the laws of conservation of linear momentum (1mark)

(ii) Use Newtons laws to derive the law in (a) (i) above. (4mark)

(b) Distinguish between elastic and inelastic collisions (1mark)

(c) An object of mass , moving with a velocity of collides with a

stationery object of equal mass. After collision, moves with a speed , at an angle of

to its initial direction, while , moves with a speed of at an angle of to the new

direction of.

(i) Calculate the speeds of (5mark)(ii) Determine whether the collision is elastic or not (3mark)

(d) (i) Define uniform acceleration. (1mark)

(ii) With the aid of a velocity-time graph, describe the motion of a body

projected vertically upwards. (3mark)

(iii) Calculate the range of a projectile which is fired at an angle of 45 to the

horizontal with a speed of . (3mark)

4. (a) Distinguish between scalar and vector quantities giving two examples of each.

(3mark)

(b) The equation for the volume, V, of a liquid flowing through a pipe in time t, under

steady flow, is given by

radius of the the pipe

pressure difference between the two ends of the pipe

length of the pipe coefficient of viscosity of the liquid.

If the dimensions of are , show that the above equation is

dimensionally consistent. (3mark)

(c) (i) What is meant by conservation of energy? (1mark)(ii) Explain how conservation of energy applies to an object falling from rest

in a vacuum. (2mark)

(d) (i) define center of gravity (1mark)

(ii) Describe an experiment to find the center of gravity of a flat irregular

piece of cardboard (3mark)

(e) Explain the laws of solid friction using the molecular theory (7mark)