Physics Annual Examinations For Secondary Schools Form 5 - Directorate For Quality And Standards In Education, 2014 Page 3
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113. Sally and Harry were playing with plasticine
2 m/s
3 m/s
A
B
spheres. The diagram shows the two spheres
0.1 kg
0.2 kg
being rolled towards each other.
a) Calculate the momentum of spheres A and B.
i) Sphere A _____________________________________________________________[2]
ii) Sphere B _____________________________________________________________ [1]
b) By considering their direction, calculate the total momentum before they collide.
________________________________________________________________________[2]
c) Fill in the blanks by choosing some of the words from the list below:
bigger than,
equal to,
smaller than,
external,
forward
The principle of conservation of momentum states that the total momentum before collision
is _______________ the total momentum after collision provided that there is no
_______________ force during the collision.
[2]
d) After the collision, the two pieces of plasticine move together.
i) In which direction do they move? _________________________________________ [1]
ii) Calculate their common speed.
_______________________________________________________________________
_____________________________________________________________________[2]
4. The diagram shows a marble placed at position A in a liquid
C
3
whose density is 1000 kg/m
. A child is playing with the
marble and moves it around.
10 cm
a) What is the pressure at the water surface called?
A
B
________________________________________________________________________[2]
b) The child moves the marble from position A to B. What happens to the amount of pressure
exerted on the marble? Explain.
________________________________________________________________________[2]
c) The child then raises the marble from position B to position C, 10 cm above.
i) Calculate the change in pressure it experiences.
_______________________________________________________________________
_____________________________________________________________________[3]
ii) Does the pressure increase or decrease? _____________________________________[1]
d) The child removes the marble from this liquid and puts it at the same depth in a denser liquid.
Does the marble experience more, less or the same pressure as before? Explain.
________________________________________________________________________[2]
Physics – Secondary Schools - Track 2 – Form 5 – 2014
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