SMK KOTA MASAI 2MONTHLY TEST 2 2011

PHYSICS FORM 4TIME : 1 HOUR

NAME : ANSWERS SCHEMEFORM :

Instruction: This paper consists of 2 parts. 20 objective questions and 3 subjective questions. Answer all questions.Arahan:Kertas ini terdiri daripada 2 bahagian. 20 soalan objektif dan 3 soalan subjektif. Jawab semua soalan.

OBJECTIVE QUESTIONS/SOALAN OBJEKTIF (20 MARKS/MARKAH)

1.

2.

3.

4.

5.

6.

7.

8.

45

A

A

D

C

B

D

C

B

Momentum of an object is defined as Momentum sesuatu objek ialah A.the tendency of an object to remain its original position /kecenderungan sesuatu objek untuk mengekalkan keadaan asal B.the product of its mass and its velocity/pendaraban jisimnya dan halajunya C.the rate of change of velocity/kadar perubahan halaju

9.

10.

11.

12.

14.

13.

15.

16.

17.

SUBJECTIVE QUESTIONS/SOALAN SUBJEKTIF (25 MARKS/MARKAH)

1.

Figure 1 shows the ticker tape represents the motion of a trolley. Each strip of the ticker tape consists of 10 dots formed by a 50 Hz ticker timer.Rajah 1 menunjukkan pita detik yang mewakili pergerakan sebuah troli. Setiap keratan pita terdiri daripada 10 detik yang dihasilkan daripada jangka masa detik 50 Hz.

a) What is the value of the initial velocity,u for the first 10 tick?Apakah nilai halaju awal,u untuk 10 detik pertama? (1m)

b) What is the value of the final velocity,v for the last 10 tick?Apakah nilai halaju akhir, v untuk 10 detik terakhir? (1m)

c) Calculate the acceleration,a of the trolley.Kira pecutan, a troli tersebut. (2m)

An object with larger momentum is Satu objek dengan momentum yang lebih besar A. hard to stop/sukar untuk berhenti B. easy to stop/mudah untuk berhenti C. bigger size/saiz lebih besar D. smaller size/saiz lebih kecil

18. 19. Momo runs 50 m for 15 seconds. His velocity is Momo berlari 50 m selama 15 saat. Halajunya ialah A. 0.3 ms-1 B. 3.3 ms-1

c. 0.6 ms-1

D. 6.6 ms-1

A 300 kg car move with a velocity 110 ms-1. What is the value of its momentum? Sebuah kereta 300 kg bergerak dengan halaju 110 ms-1. Apakah nilai momentumnya? A. 33 000 kg ms-1 B. 2.72 kg ms-1 C. 0.37 kg ms-1 D. 30 000 kg ms-1

20.

2 cm = 10 cms-1

0.02x10

8 cm = 40 cms-1

0.02x10

40-10 = 30 cms-2

0.02x(6-1)

2.

The graph above represents the motion of a motorcyclist in 20 seconds. Graf di atas mewakili gerakan seorang penunggang motosikal dalam masa 20 saat.

a) What is the acceleration, a at t=2?Apakah pecutan,a pada t=2? (1m)

b) What is the velocity,v at t=6?Apakah halaju,v pada t=6? (1m)

c) Calculate the deceleration from t=10 until t=14.Kira nyahpecutan mulai t=10 hingga t=14. (2m)

d) At what t describe that the motorcyclist is at rest?Pada t berapakah menyatakan penunggang motosikal berada dalam keadaan rehat? (1m)

3. (Answer in the paper given.Jawab dalam kertas jawapan yang diberikan.)Figure 6 shows two plasticine balls being thrown at a rubberized board and a concrete wall from the same position.Rajah 6 menunjukkan dua bola plastisin dibaling pada papan getah dan dinding konkrit dari kedudukan yang sama.

Rajah 6 Rajah 7Figure 7 shows the conditions of the plasticine balls after they hit the two surfaces.Rajah 7 menunjukkan keadaan bola plastisin selepas melanggar dua permukaan tersebut.

2.5 ms-2

10 ms-1

0-20 = -5ms-2 4

t=14 until t=18

a) What is meant by impulsive force?Apakah yang dimaksudkan dengan daya impulse? (1m)

b) Observe Figures 6 and 7. Compare the shapes of the plasticine balls, the surfaces of the rubberized board and concrete wall before and after hit the surfaces. Based on the surfaces and the shapes of the plasticines balls, deduce and name a relevant physical concept that describes this phenomenon.Perhatikan Rajah 6 dan 7. Bandingkan bentuk bola plastisin, permukaan papan getah dan dinding konkrit sebelum dan selepas melanggar permukaan tersebut. Berdasarkan permukaan dan bentuk bola plastisin, deduksi dan namakan satu konsep fizik yang relevan yang menerangkan fenomena ini. (5m)

c) State and explain five safety features in a car that can be used to protect the driver and the passengers in the car.Nyata dan terangkan lima ciri keselamatan dalam kereta yang boleh digunakan untuk melindungi pemandu dan penumpang di dalam kereta. (10m)

Scheme 3.

a) The rate change of momentum

b)-The concrete wall is hard while the rubberized board is soft.

-Time for the plasticine to hit the surface is longer for concerete wall than the rubberized board.

-Whan the time is longer, the force produce is small, the shape of plasticine is not change at all whan hit the rubberized board while whan the time is shorter, the force is big, the shape of plasticine change a lot whan hit the concrete wall.

-The physics concept is the impulsive force.

c) -HEADREST-To support head and neck as well as prevent serious injury to the neck due to inertia during the accident

-AIRBAG-It inflates to absorb the impact of the crash and prevents the driver from hitting the steering wheel, dashboard or windscreen due to inertia during the crash

-WINDSCREEN-Specially designed to fracture into small rounded pieces upon impact so that the passengers will less likely to be cut by the glass pieces

-CRUMPLE ZONE-An area of a car that is designed to compress during an accident to absorb energy from the impact and to increase the impact time so that it will reduce the impulsive force acting on the car

-ANTI-LOCK BRAKING SYSTEM (ABS)-System that enables drivers to quickly stop the car without causing the brakes to lock that can help drivers to control their cars from skidding

-SIDE IMPACT BAR-It is installed inside the door frame to absorb the energy and reduce damage, injury and intrusion to the passenger compartment when the car is hit from the side

-BUMPER-System where in a low speed collision, it absorbs the shock to prevent or reduce damage to the car which are mounted on the front and rear of a car

-SEAT BELT-Its function is to keep wearers tightly pressed to their seats when car decelerates rapidly and prevent the passengers from being thrown forward due to their inertia

Prepared by:

(MR. MUHAMAD ZULHELMY B. ZULKIPLI) SMKKM2 PHYSICS TEACHER