Which ONE of the following statements about the forces acting on the car is CORRECT?
A - NSC Physical Sciences - Question 1 - 2019 - Paper 1
Question 1
Which ONE of the following statements about the forces acting on the car is CORRECT?
A. The net force acting on the car is zero.
B. There are no forces acting on t... show full transcript
Worked Solution & Example Answer:Which ONE of the following statements about the forces acting on the car is CORRECT?
A - NSC Physical Sciences - Question 1 - 2019 - Paper 1
Step 1
Which ONE of the following statements about the forces acting on the car is CORRECT?
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Answer
A. The net force acting on the car is zero. Since the car is moving at a constant velocity, the forces acting on it must be balanced, leading to no net force.
Step 2
Which ONE of the following statements about the acceleration of the ball at its maximum height is CORRECT?
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Answer
B. The acceleration is equal to g and is directed downwards. At maximum height, the velocity is zero but gravitational acceleration remains acting downwards.
Step 3
Which ONE of the following is the CORRECT representation of the magnitude of force x shown on the graph?
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Answer
D. ( \frac{1}{36}F ). This indicates how gravitational force decreases with distance from the Earth, particularly beyond two radii.
Step 4
Which ONE of the following statements about the collision of the balls is CORRECT?
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Answer
D. Total momentum is conserved but total kinetic energy is not conserved and the masses of the balls are equal. This describes an inelastic collision.
Step 5
Which ONE of the graphs below shows the CORRECT relationship between the gravitational potential energy (U) and speed (v) and the kinetic energy (K) and speed v, respectively, for the stone?
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Answer
B. This graph accurately represents the conversion of potential energy into kinetic energy during free fall.
Step 6
Which ONE of the statements about the electrostatic forces, F_{PR}, which P exerts on R and F_{RP}, which R exerts on P, is CORRECT?
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Answer
B. ( F_{PR} = F_{RP} ). According to Newton's third law, the forces exerted by both charges on each other are equal.
Step 7
Which ONE of the following combinations about the ammeter readings will be CORRECT when switch S is open and when switch S is closed?
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Answer
C. Ammeter reads the current in both R1 and R2 when switch S is closed, but only reads the current in R1 when switch S is open.
Step 8
Which ONE of the following statements about the threshold frequencies of the metals is CORRECT?
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Answer
A. The threshold frequency of zinc is greater than that of magnesium. This is due to the work function being higher for zinc.
