Sction B : Science experiment
Topic : Friction
Question 1(a):
Aim: To investigate the relationship between the types of surfaces and the distance travelled by a trolley
Problem: Does the type of surface affect the distance travelled by a trolley?
Hypothesis: The rougher the surface, the shorter the distance travelled by the trolley.
Variable: (a) that is changed (manipulated) : The type of surface
(b) that is observed (responding) : The distance travelled by the trolley
(c ) that are kept the same (constant) : The trolley, the height of the wooden block
Materials: Trolley, wooden block, sandpaper, wooden plank, glass sheet, measuring tape, ramp
Method:
1 The apparatus is set up as shown in the diagram above.
2 The trolley is released from the top of the ramp so that it moves down the ramp and goes along the sandpaper.
3 The distance covered by the trolley on the sandpaper is measured using a measuring tape.
4 Steps 1-3 are repeated by replacing the sandpaper with a wooden plank and glass sheet.
Sample Observation:
The distance travelled by the trolley (cm) | |
Sandpaper | 25 |
Wooden plank | 46 |
Reason (Inference):
1 Sandpaper has the greatest friction. Therefore, the distance travelled is the shortest.
2 Glass sheet has the least friction. Therefore, the trolley travels the furthest.
Conclusion:
The rougher the surface , the shorter the distance travelled by the trolley. Hypothesis is accepted.
Question 1(b):
Teacher start lesson by explaining about friction. Student s are suppurate in a three group, one group have 5 students, they discuss about friction in groups. All group have get ready to do the experiment. They also have prepare the things such as wooden block, trolley, ramp and sandpaper, wooden plank, glass sheet.
Teacher explain the aim of the experiment that is “to investigate the relationship between the types of surfaces and the distance travelled by a trolley” and teacher ask students, “Does the types of surface affect the distance travelled by a trolly?,” .
Group A and D are answered teacher’s question that is “The rougher the surface, the shorter the distance travelled by the trolley. The other groups are answered that “ The rougher the surface, the longer the distance travelled by the trolley”. Teacher ask students to start the experiment for see the affect of the trolley.
Students set up the apparatus as shown in the diagram above. Every groups are released from the top of the ramp so that it moves down the ramp and goes along the sandpaper. The distance covered by the trolley on the sandpaper is measured using a measuring tape. Steps 1-3 are repeated by replacing the sandpaper with a wooden plank and glass sheet. They observed the distance travelled by the trolley(cm) and take notes. The note are given below,
Group A
The distance travelled by the trolley (cm) | |
Sandpaper | 26 |
Wooden plank | 50 |
Group B
The distance travelled by the trolley (cm) | |
Sandpaper | 28 |
Wooden plank | 44 |
Group C
The distance travelled by the trolley (cm) | |
Sandpaper | 25 |
Wooden plank | 46 |
Group D
The distance travelled by the trolley (cm) | |
Sandpaper | 30 |
Wooden plank | 43 |
Group E
The distance travelled by the trolley (cm) | |
Sandpaper | 23 |
Wooden plank | 47 |
Students presented what they observed in front of the class and they make a conclusion for this experiment that is “ The rougher the surface, the shorter the distance travelled by the trolley. Group A and D’s hypothesis is accepted.
All students are enjoyed participated to do this experiment. Some students cannot make correct hypothesis before do the experiment but after finished doing this experiment, student can understand deeply about the concept.
Group :
Name of the members:
Date:
Subject:
Topic:
Observation:
The distance travelled by the trolley (cm) | |
Sandpaper | |
Wooden plank | |
Conclusion:
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