PRA U1SEKOLAH MENENGAH KEBANGSAAN RAJA PEREMPUAN,IPOHTRIAL STPM SEM 1 2014 PHYSICSOCTOBER1 Hour

NAME : ____________________________ CLASS : PRA U1 AV

Section A( 15 marks )Answer all questions in this section

Write your objective answers in the table below.

1611

2712

3813

4914

51015

Section B ( 15 marks)Answer all questions in this section

16.(a) state the conditions for the equilibrium of the body [ 2marks]

(b) A uniform ladder of weight 150 N is leaned against a smooth wall, and is placed on a rough floor is shown in the diagram below.

The coefficient of friction between the floor and the ladder is 0.38.( i) sketch a diagram showing all the forces acting on the ladder [ 1mark](ii)Determine the angle when the ladder is about to slide [ 4 marks]

17.(a) A wire of cross-sectional area of 0.52 mm2 and natural length 60.0 cm is streched at both ends by aforce 50 N as shown in the figure

( i) what is the stress on the stress on the wire? [ 2 marks]( ii) If the extension is 0.12 cm, what is the strain? [ 2 marks](iii) calculate the Youngs modulus [1 mark](iv) What is the strain energy of the streched wire? [1 mark]

(b) Distinguish between elastic deformation and plastic deformation [ 2 marks]

Section C ( 30 marks)Answer only two questions in this section

19.(a)

(b)

(c)

20

THIS QUESTION PAPER CONSISTS OF 6 PRINTED PAGES

End of question paperPrepared by :( PN. NUR AISYAH BT ABDUL HASHIM) Penyelaras Fizik Pra UChecked and Verified by:

( Encik Ahmad Khusairi b. mohd salleh) Penolong kanan Tingkatan 6

ANSWER TRIAL PHYSICS STPM SEM 1 201416. ch 7- stpm 201417- ch 8- Q 11 pelangi pg 19618- Ch 5- stpm 201419- ch6- stpm 201320- Ch 9- stpm 2004

16.

17.

(b) elastic deformation: object returns completely to original dimensionsPlastic deformation:permanent deformation is produced.

18.

19

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