14.5.19

2A5m - letupan (mengira halaju skateboard), Hukum Gerakan Newton ke 3

2.
Diagram 2.1 shows a boy of mass 50 kg standing on a stationary skateboard of mass 2.5 kg. He then jumps off from skateboard with a velocity of 2 m s-1 and caused the skateboard moves to the left as shown in Diagram 2.2.
Rajah 2. 1 menunjukkan seorang budak berjisim 50 kg berdiri di atas papan luncur berjisim 2. 5 kg yang pegun. Budak itu kemudiannya melompat dari papan luncur dengan halaju 2 m s-1 dan menyebabkan papan Juncur bergerak ke kiri seperti dalam Rajah 2. 2.


Diagram 2.1                                                                       Diagram 2.2
Rajah 2.1                                                                            Rajah 2.2


(a)
What is meant by momentum?
Apakah yang dimaksudkan dengan momentum?
………………………………………………………………………………………….[1 mark / 1 markah]


(b)
State the concept shown in the diagram above? Circle the correct answer.
Nyatakan konsep yang terlibat dalam rajah di atas? Bulatkan jawapan yang betul.

Elastic Collision / Inelastic Collision / Explosion
Perlanggaran Kenyal / Perlanggaran Tak Kenyal / Letupan
 [1 marks / 1 markah]

(c)
Calculate the velocity of the skateboard after the boy jumps off.
Hitungkan halaju papan luncur selepas budak itu melompat turun.






……………………………………………………………………………………………………….[2 marks / 2 markah]



d)
State the Physics Law involved in the diagram above?
Nyatakan Hukum  Fizik yang terlibat dalam rajah di atas?             

………………………………………………………………………………………   [1 marks / 1 markah]                                                                                                                    



JAWAPAN : 

a) Product of mass and velocity
b) Explosion
c) 0=2.5v - 50(2)
     v= 100/2.5  ms-1
      v= 40 ms-
d)  Hukum Gerakan Newton ke 3

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