1.1 According to Newton's Second Law of Motion, the acceleration of an object is …
A independent of its mass - NSC Physical Sciences - Question 1 - 2017 - Paper 1
Question 1
1.1 According to Newton's Second Law of Motion, the acceleration of an object is …
A independent of its mass.
B always equal to its mass.
C directly proportional to ... show full transcript
Worked Solution & Example Answer:1.1 According to Newton's Second Law of Motion, the acceleration of an object is …
A independent of its mass - NSC Physical Sciences - Question 1 - 2017 - Paper 1
Step 1
1.1 According to Newton's Second Law of Motion, the acceleration of an object is …
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Answer
According to Newton's Second Law of Motion, the acceleration of an object is directly proportional to the net force acting on it and inversely proportional to its mass. Therefore, the correct answer is:
Answer: C directly proportional to its mass.
Step 2
1.2 Which ONE of the following statements about the tensions is CORRECT?
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Answer
In the case of suspended blocks, the tension decreases as we move downward. Thus, the correct statement regarding the tensions is:
Answer: A T_P > T_Q > T_R.
Step 3
1.3 Which ONE of the following velocity-time graphs CORRECTLY describes the motion of the ball?
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Answer
The velocity increases as the ball goes up until it reaches its maximum height, then decreases as it falls back down. The correct graph would show a parabolic shape symmetrical about the maximum height.
Answer: C.
Step 4
1.4 When the velocity of a moving object is doubled, the …
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Answer
When the velocity is doubled, the kinetic energy, given by the formula KE=21mv2, will increase by a factor of four (since 22=4). Hence, the correct answer is:
Answer: B kinetic energy of the object is doubled.
Step 5
1.6 What can you conclude about the source from this observation?
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Answer
If the listener perceives a sound of a lower pitch, it suggests the source is moving away from the observer. This phenomenon is known as the Doppler effect.
Answer: C The source is moving away from the listener.
Step 6
1.7 Which ONE of the graphs below CORRECTLY represents the relationship between the electrostatic force, F_E and the square of the distance, r^2, between the two charges?
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Answer
According to Coulomb's Law, the electrostatic force is inversely proportional to the square of the distance between the charges. Therefore, the graph should slope downwards as r2 increases. Hence, the correct graph is:
Answer: B.
Step 7
1.8 Which ONE of the following statements concerning the voltmeter readings is CORRECT?
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Answer
Since the resistances are in series, the voltage across both resistors divided by their resistances gives the same reading on both voltmeters. Therefore, the correct relationship is:
Answer: A V_1 = 2V_2.
Step 8
1.9 In a DC generator, the current to the external circuit is delivered through the …
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Answer
In a DC generator, the external circuit receives current through split rings (commutators) which convert the AC voltage generated into DC voltage.
Answer: D split rings (commutators).
Step 9
1.10 The number of electrons ejected from the metal surface is proportional to the …
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Answer
According to the photoelectric effect, the number of emitted electrons is directly proportional to the number of incident photons, provided the frequency is above the threshold frequency.
