## Wednesday, November 17, 2010

### SPM Trial MARA 2010 ~ paper 2 ( Impulsive force )

Question 2
Diagram 2 shows a baseball player wearing a soft thick glove to catch a ball during a baseball match.
Rajah 2 menunjukkan seorang pemain bola lisut memakai sarung tangan tebal yang lembut untuk menangkap bola semasa pertndingan bola lisut.

(a) What is meant by impulsive force?
Apakah maksud daya impuls?

(b) The ball of mass 0.15 kg moves with a velocity of 20 m s when it is hit.
Calculate the impulsive force acting on the glove when the time of impact is 8.0 x 10 -2 s.

Bola berjisim 0.15 kg bergerak dengan kelajuan 20 m s apabila dipukul.
Hitungkan daya impuls yang bertindak ke atas sarung tangan jika masa tindakbalas 8.0 x 10 -2 s.

(c) Compare the impulsive force if the baseball player wears a hard glove to catch the ball. Explain your answer.
Bandingkan daya impuls yang di hasilkan jika pemain itu menggunakan sarung tangan yang keras untuk menangkap bola. Jelaskan jawapan anda.

Hits for answer the problem :
Decreasing the time of impact will increase the magnitude of the impulsive force, and vice versa.

a)
Impulsive force is defined as the rate of change of momentum in a collision or explosion.

b)

c) A larger impulsive force is produced if the baseball player wears a hard glove. Because the time interval of interaction is small.