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ACE YOUR PSLE SCIENCE
Lesson 25: Worksheet Questions
Name: ___________________________________ Date: ______________________
Lesson 25: Energy
Section A (5 marks)
For each question from 1 to 5, 4 options are given. One of them is the correct
answer. Make your choice, (1, 2, 3 or 4) and write the number in the brackets
provided. Each question carries 1 mark. You should not take more than 10
minutes in this section.
1.
The diagram below shows a ball placed at the top of a slope at Point P.
It is then allowed to roll down the slope from Point P.
Which of the following graphs best describes the changes in the
amount of potential and kinetic energy of the ball from Point P to
Point S?
1)
2)
3)
4)
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ACE YOUR PSLE SCIENCE
Lesson 25: Worksheet Questions
2.
Amy set up an experiment to study the energy changes which take
place when an object is moving.
She released a marble from the top of ramp X. It rolled downwards and
along the floor before it travelled up ramp Y and rolled down again. It hit
against wooden block Z with a soft thump and stopped moving.
Which of the following statements are true for the above experiment?
A:
When the marble was released, it gained potential energy.
B:
When the marble was travelling up ramp Y, kinetic energy was
converted to potential energy.
C:
When the marble hit wooden block Z, some of its energy was
converted to heat energy and sound energy.
D:
When the marble was moving along the floor, some of its energy
was converted to kinetic energy.
1) A and C only
3) B and D only
2) B and C only
4) C and D only
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ACE YOUR PSLE SCIENCE
Lesson 25: Worksheet Questions
3.
Kenneth conducted an experiment as shown in the diagram below.
He pulled the rubber band backwards together with a stone to position
A. When he released the stone, it moved forward and hit the block. The
block, which was suspended by a string, swung upwards to position B
and then to position C before falling back.
Which one of the following shows the correct energy transfer?
1)
Chemical potential energy Kinetic energy in stone Kinetic
energy in block Heat and sound energy
2)
Elastic potential energy Kinetic energy in stone Gravitational
potential energy in block Heat and sound energy
3)
Elastic potential energy Kinetic energy in stone Kinetic
energy in block + Heat energy + Sound energy Gravitational
potential energy in block
4)
Chemical potential energy Kinetic energy in stone Gravitational potential energy in block Kinetic energy in block +
Heat energy + Sound energy
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ACE YOUR PSLE SCIENCE
Lesson 25: Worksheet Questions
4.
Jeremy constructed a pendulum by securing a rubber ball to a string
and attaching it to a retort stand. He then made it swing as shown in the
diagram below.
He then plotted a graph to show how the potential energy and kinetic
energy of this pendulum change with the height of the swinging rubber
ball. His teacher commented that he had accurately shown his
observations in his graph. Which one of the following graphs is probably
what Jeremy had shown his teacher?
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ACE YOUR PSLE SCIENCE
Lesson 25: Worksheet Questions
5.
A metal ball rolls from rest at Point A down the track to Point E as
shown below.
At which point along the track will the metal ball have the most kinetic
energy?
1) B
2) C
3) D
4) E
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ACE YOUR PSLE SCIENCE
Lesson 25: Worksheet Questions
Section B
Write your answers to questions 6 to 10.
The number of marks available is shown in brackets [ ] at the end of each
question or part question. You should not take more than 10 minutes in this
section.
6.
The diagram below shows a side view of a roller coaster car ride.
a)
Using the axes given below, draw the graph to show the change
in the amount of gravitational potential energy of the roller coaster
as it moves from point A to point C.
[1]
Amount of
potential
energy
A
B
C
Time
Below are the different roller-coaster cars moving on the tracks.
b)
If all the above roller-coaster cars are moving equally fast, which
one has the most kinetic energy? Why?
[2]
____________________________________________________
____________________________________________________
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ACE YOUR PSLE SCIENCE
Lesson 25: Worksheet Questions
7.
Study the set-up as shown below.
An iron bell was hung near an iron bar in the circuit above. When the
switch in the circuit was closed and opened continuously, the bell would
ring.
a)
State the energy conversion in the above situation. Write your
answer in the boxes provided below.
[2]
b)
Explain why the circuit was closed and opened continuously for
the bell to ring.
[2]
____________________________________________________
____________________________________________________
____________________________________________________
____________________________________________________
c)
If the iron bar was replaced with a magnet bar, would the bell
continue to ring when the switch was opened and closed
continuously? Give a reason for your answer.
[2]
____________________________________________________
____________________________________________________
____________________________________________________
____________________________________________________
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ACE YOUR PSLE SCIENCE
Lesson 25: Worksheet Questions
8.
9.
The diagram below (not drawn to scale) shows how a pile driver works.
a)
At stage A, what energy did the ram possess before it was
released?
[1]
____________________________________________________
b)
At stage B, what energy did the ram possess when the ram was
falling?
[1]
____________________________________________________
c)
What must be done to the ram to increase the type of energy
mentioned in part (b)?
[1]
____________________________________________________
The diagram below shows a torch. It lights up when the switch is
pushed to the right.
a)
Write down below the energy changes when the switch is pushed
to the right.
[2]
_________energy (in the batteries) _________energy (in the
spring) _________energy + _________ energy (in the lighted
bulb)
b)
Name the energy in the compressed spring that pushed the
batteries against the bulb.
_______________________ energy
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ACE YOUR PSLE SCIENCE
Lesson 25: Worksheet Questions
10.
A ball was dropped from a table. The path it took was represented by
the dotted lines as shown in the diagram below.
Tom repeated the experiment three times and recorded the bouncing
height of the ball at B, C and D in the table below.
Number of
tries
1st
2nd
3rd
Average
height
B
60
59
61
Maximum height (cm) at
C
45
45
44
60
45
D
31
30
30
30
a)
At which position (A, B, C or D) did the ball have the least
potential energy?
[1]
____________________________________________________
b)
Explain why the bouncing height of the ball decreases.
[1]
____________________________________________________
c)
Why did Tom conduct the experiment three times?
[1]
____________________________________________________
____________________________________________________
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