Form 3 Physics - Boys'' Secondary Mosta Half-Yearly Examinations - Kullegg Maria Regina, 2016 Page 5
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104. This question is about pressure.
a) Martin stands on his skateboard as shown in Figure 4. Martin has a weight of 340 N
while the skateboard’s weight is 20 N. Calculate the total force acting on the ground.
_______________________________________________________________________________ [1]
Figure 4
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b) The skateboard has four wheels. Each wheel has an area of 2.5 cm
in contact with the
ground. Calculate:
2
(i) the total area in contact with the ground in cm
_______________________________________________________________________________ [1]
2
(ii) the total pressure exerted on the floor in N/cm
.
______________________________________________________________________________
[2]
______________________________________________________________________________
c) Would the pressure on the ground increase, decrease or remain the same compared with
Figure 4, when:
(i) Martin stands on the skateboard wearing his school bag? Explain.
______________________________________________________________________________
______________________________________________________________________________
[2]
(ii) Martin balances his skateboard on two wheels only? Explain.
______________________________________________________________________________
[2]
______________________________________________________________________________
Page 5 of 10
Physics Half yearly exam 2016– Track 3 - Form 3
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