Physics Boys' Secondary Mosta Half-Yearly Examinations Form 3 - Kullegg Maria Regina, 2015-2016 Page 8
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107. This question is about forces.
a) Label the force acting in each case.
(i)
(ii)
[2]
b) Sam pulls a metal block using a force sensor connected to a data logger and measures
the friction just before the block moves. He repeats the experiments by adding more
metal blocks on top of each other.
(i) Draw on the diagram an arrow showing the direction of friction acting on the blocks. [1]
force
metal
data
sensor
logger
blocks
He obtains the results in the table below.
Mass of metal blocks (kg)
0
1
2
3
4
5
Frictional force (N)
0
0.5
1.0
1.5
2.0
2.5
(ii) Plot a graph of Frictional force (N) on y-axis against mass of blocks (kg) on x-axis.
[6]
(iii) Complete:
As the mass of the metal blocks increases, the frictional force ______________________. [1]
(iv) Using the graph or otherwise, find the frictional force when the total mass is 2.5 kg.
______________________________________________________________________________ [2]
(v) Sam thinks that there is more friction if oil is applied on the ground surface? Is he
correct? ____________
[1]
(vi) On the diagram draw an arrow to show the upward force exerted by the ground on
the blocks.
[1]
(vii) This upward force is called ___________________________.
[1]
Page 8 of 10
Physics Half yearly exam 2016– Track 2 - Form 3
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