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Physics Form 4 Chapter 2 Force and Motion I

Results:
Table 2.8
1. Mass of trolley, m / unit 1 2 3
Initial velocity, u / cm s –1
Final velocity, v / cm s –1
Acceleration, a / cm s –2

1
2. A graph of aceleration a against is plotted and the graph is a straight line
mass of trolley, m
1 Acceleration, a / cm s –2
passing through the origin. Therefore a ∝ if F is constant.
m Chapter

Conclusion:
When the pulling force is constant, the bigger the mass of the trolley, the
smaller is its acceleration. The hypothesis is accepted. 2
0 1 1
1
– – –
3 2
Mass of trolley, m
Figure 2.74
Experiment 2.5
Eksperimen 2.1
Eksperimen 2.1
Problem statement: An object accelerates when acted upon by a force. What will happen to its
acceleration if its force increases but the mass is constant?
Aim: To find the relationship between acceleration and force when the mass is constant.

Hypothesis: If a mass of an object is constant, the bigger the force, the bigger is its acceleration.
Variables:
(a) manipulated variable : Force
(b) responding variable : Acceleration
(c) fixed variable : Mass

Apparatus and materials: Ticker timer, 12 V a.c. power supply, 2 trolleys, elastic string, inclined plane,
support, ticker tape, cellophane tape.
Procedure:
Ticker timer Elastic string

Ticker tape Friction
compensated
inclined plane

12V a.c. power Support Trolley
supply
Figure 2.75
1. The apparatus is arranged as shown in Figure 2.75.
2. The inclined plane is adjusted for friction compensation.
3. A system consisting of two trolleys stacked together is used. A ticker tape is attached to it and
passes through the ticker timer.

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