Physics Worksheet - Annual Examinations For Secondary Schools, 2013 Page 2
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10SECTION A: Answer all questions. This section has a total of 40 marks.
1.
The diagram shows a lady and a child pushing a shopping trolley. The lady pushes
with a force of 40 N and the child with a force of 10 N.
(a)
What is the total horizontal force on the trolley?
________________________________________________
(1)
(b)
Calculate the work done to push the trolley a distance
of 80 m.
________________________________________________
(2)
(c)
On the diagram draw two other forces acting on the
trolley.
(2)
(d)
Name one of these forces acting on the trolley.
__________________________
(1)
(e)
It takes 100 seconds to push the trolley a distance of 80 m. Calculate the power.
___________________________________________________________________________
___________________________________________________________________________
(2)
2.(a) Complete the following sentences about the energy changes in a
washing machine.
(i)
An electric motor in a washing machine is designed to transform
_______________ energy into _______________ energy.
(2)
(ii)
Some of the energy supplied to the motor is wasted as _______________ energy and
_______________ energy.
(2)
o
(b)
Would more or less energy be required to wash the clothes at a temperature of 60
C
o
instead of 40
C ? Explain.
___________________________________________________________________________
(2)
(c)
An ‘ A ’ rated washing machine uses an input power of 600 W to give 420 W of output
power. Calculate its efficiency.
__________________________________________________________________________
(2)
Physics – Secondary Schools – Track 3 – Form 3 – 2013
Page 2 of 10
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