Page 27 - Pra U STPM 2021 Penggal 1 - Physics

Physics Term 1 STPM Chapter 2 Kinematics
(i) Describe qualitatively the motion of The total stopping distance is the sum of the
the trolley during the periods OA, AB distance travelled by the vehicle during the
and BC. reaction time of the driver and the distance
(ii) Calculate the acceleration of the travelled when the brakes are applied.
x
trolley down the incline. Draw a graph of against v. Use the graph to
(iii) Find the length of the incline. find v
(iv) Calculate the distance the trolley (a) the total stopping distance if the velocity
2 moved up the incline on the of the vehicle is 35 m s .
–1
rebounce. (b) the reaction time of the driver.
15. The table below shows the total stopping
distance x for different velocities v of a
vehicle.

v/m s –1 10.0 15.0 20.0 25.0 30.0

x/m 20.0 37.5 60.0 87.5 120.0

ANSWERS

1 2. 22 m s –1
2h
1. (a) Use v = u + at 3. g = 2 2
t 2 – t 1
(i) 2.0 m s –1
(ii) 4.0 m s
–1
(iii) 10.0 m s –1 3
1 1. C 2. B 3. C 4. C 5. A
(b) Use average speed = (u + v)
2 6. C 7. C 8. B 9. C
(i) 1.0 m s –1
(ii) 2.0 m s –1 10. (a) Displacement
(ii) 5.0 m s –1
(c) Use s = average speed × time
(i) 1.0 m (ii) 4.0 m

(iii) 25.0 m
2. 25 m Time
3. 48 m s –1 0 t 1 t 2
(b) Acceleration
2
1. (a) Use v = u + at, t = 0.815 s
(b) Use v = u – 2gH Time
2
2
H = 3.26 m above the building. 0 t 1 t 2
= 12.26 m from the ground
1
2
(c) Use s = uT – gT , s = –9.0 m
2
T = 2.40 s
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02 STPM PHY T1.indd 56 4/9/18 8:19 AM