Which ONE of the following statements about the forces acting on the car is CORRECT?
A car is moving at a constant velocity - 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 car is moving at a constant velocity.
A. The net force acting on the car is ... show full transcript
Worked Solution & Example Answer:Which ONE of the following statements about the forces acting on the car is CORRECT?
A car is moving at a constant velocity - 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.
This is because a car moving at a constant velocity implies that the forces acting on it are balanced, resulting in a net force of zero.
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. g and is directed downwards.
At the maximum height of its trajectory, while the velocity of the ball is zero, the acceleration due to gravity (g) is still 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
C. ( \frac{1}{6}F )
As the distance from the center of the Earth increases, the gravitational force decreases according to the inverse square law.
Step 4
Which ONE of the following statements about the collision of the balls is CORRECT?
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Answer
C. Total momentum and total kinetic energy are conserved and the masses of the balls are equal.
Since ball M comes to rest and ball N moves away with speed v, it suggests a perfectly elastic collision where both momentum and kinetic energy are conserved.
Step 5
Which ONE of the graphs below shows the CORRECT relationship between the gravitational potential energy (U) and speed and the kinetic energy (K) and speed, respectively, for the stone?
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Answer
B. Graph K
In free fall, as the gravitational potential energy decreases, the kinetic energy increases, resulting in a hyperbolic relationship between the two.
Step 6
Which ONE of the statements below 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 Coulomb's law, the forces exerted by two charges on each other are equal in magnitude and opposite in direction.
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 ( R_1 ) and ( R_2 ) Ammeter reads current in both ( R_1 ) and ( R_2 )
When both resistances are connected in parallel, the ammeter reads the total current flowing through both resistors.
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.
Zinc has a higher work function than magnesium, thus its threshold frequency is greater.
