Page 23 - Pra U STPM 2021 Penggal 1 - Physics

Physics Term 1 STPM Chapter 2 Kinematics

Quick Check 5

1. A small metal sphere is held just below the C Acceleration / m s –2
surface of a viscous liquid in a tall vessel. It
is then released and its displacement s with 10
time t is plotted. Which of the following is the
2 s-t graph?
A s C s
0 Time

D Acceleration / m s –2

t t 10
0 0
B s D s

0 Time

4. A ball is thrown vertically upwards in a viscous
t t medium. The time of flight for the upwards
0 0
motion is t u and for the downwards motion is
t d . Which of the following is correct?
2. A steel sphere is held a short distance below
the surface of a liquid in a deep vessel and A t d > t u because the ball moves faster on its
then released. The terminal velocity of the downwards motion and the viscous drag
sphere in the liquid is independent of is greater.
A the height of the liquid in the vessel B t d > t u because the magnitude of the
B the density of the liquid acceleration when the ball is moving
C the diameter of the sphere down is smaller than the magnitude of the
D the temperature of the liquid retardation during the upwards motion.
C t d < t u because the viscous drag is the
3. Which one of the following graphs represents greatest at the moment of projection.
the acceleration of a small rain drop falling D t d < t u because at a given speed the
through the air. Acceleration due to gravity net accelerating force when the ball
–2
g = 10 m s . is moving downwards is greater that the
A Acceleration / m s –2 net retarding force when it is moving
upwards.
10

5. Four spheres are released from the top floor of
a skyscraper and fall through air to the ground.
The spheres attain the terminal velocity before
0 Time reaching the ground. The sphere with the
B Acceleration / m s –2 greatest terminal velocity is
A steel sphere of radius 1 cm
10
B steel sphere of radius 2 cm
C polystyrene sphere of radius 1 cm
D polystyrene sphere of radius 2 cm

0 Time

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