Rajah 4 menunjukkan seorang pelajar sedang terjun dari tembok berketinggian 5 m
Diagram 4 / Rajah 4
(a) (i) State the energy change occurs
Nyatakan perubahan tenaga yang berlaku
……………………………………………………………………………….
[1 mark / 1 markah]
(ii) Name the physical quantity that remain constant during the fall
Namakan kuantiti fizikal yang tidak berubah semasa jatuhan
…………………………………………………………………………………………..
[1 mark / 1 markah]
(b) Calculate the velocity of the student just before he reach the floor
Kirakan halaju pelajar itu sejurus sebelum ia sampai ke lantai
[2marks /2 markah]
(c) (i) The mass of the student is 50 kg. If he stops in 0.2 s as he reach the floor.What is the impulsive force on him
Jisim pelajar tersebut ialah 50 kg. Sekiranya beliau berhenti dalam masa 0.2 s setelah sampai ke lantai. Apakah daya impuls yang bertindak ke atas pelajar tersebut.
[2marks /2 markah]
(ii) Suggest 2 ways to reduce the impulsive force on him.
Cadangkan dua cara untuk mengurangkan daya impuls yang bertindak ke atasnya
………………………………………………………………………………..
………………………………………………………………………………..
[2marks / 2 markah]
Jawapan :
No
|
Answer
|
Marks
|
|
4
|
a(i)
|
Gravitional potential
energy Kinetik energy
|
1
|
(ii)
|
Weight / accelaration / mass
|
1
|
|
b
|
V2
= u2 + 2as or mgh = ½mv2
= 0
+ 2(10)5
= 10 m/s
|
1
1
|
|
c(i)
|
F
= (mv –mu)/t
= [(50(0) – 50(10)]/0.2
= -500/0.2
= -2500 N
|
1
1
|
|
(ii)
|
Bend
the knee / use pillow / thick shoes
|
1
|
|
TOTAL
|
7
|
No comments:
Post a Comment