CIE iGCSE Co-Ordinated Science P1.2 Motion Exam Style Questions Paper 1
Question
An object is falling freely near the Earth without air resistance. Which statement about the acceleration of the object is correct?
A. It is constant, but not zero.
B. It is decreasing.
C. It is increasing.
D. It is zero.
▶️Answer/Explanation
Answer: A
Explanation: In free fall near the Earth, the acceleration due to gravity is constant at approximately 9.8 m/s², assuming no air resistance.
Question
A girl runs 5000 m in 1200 seconds and then walks a further 3000 m in 1800 seconds. What is her average speed for this journey?
A. 1.7 m/s
B. 2.7 m/s
C. 2.9 m/s
D. 5.8 m/s
▶️Answer/Explanation
Answer: B
Explanation: The total distance is 5000 m + 3000 m = 8000 m. The total time is 1200 s + 1800 s = 3000 s. Average speed = total distance / total time = 8000 m / 3000 s = 2.7 m/s.
Question
A vehicle moves a total distance of 300 m in 40 seconds. What is its average speed?
A. 0.13 m/s
B. 7.5 m/s
C. 340 m/s
D. 12,000 m/s
▶️Answer/Explanation
Answer: B
Explanation: Average speed is calculated as total distance divided by total time. Therefore, 300 m / 40 s = 7.5 m/s.
Question
Which distance–time graph represents an object that is decelerating?
▶️Answer/Explanation
Answer: A
Explanation: A decelerating object will have a decreasing slope on a distance-time graph, indicating that its speed is decreasing over time.
Question
A student uses a stopwatch to measure the time taken for a ball to drop 2.0 m to the ground. The measurement is taken five times. These are the results: 20.16 s, 20.22 s, 20.14 s, 20.22 s, 20.26 s. Which value for the time taken should be used?
A. 20.16 s
B. 20.20 s
C. 20.22 s
D. 20.26 s
▶️Answer/Explanation
Answer: B. 20.20 s
Explanation: The average of the five measurements should be used to minimize errors. The average of 20.16, 20.22, 20.14, 20.22, and 20.26 is 20.20 s.
Question
Which speed–time graph represents the motion of an object in free fall with no air resistance?
A) speed increases linearly with time
B) speed decreases linearly with time
C) speed remains constant with time
D) speed increases at a constant rate with time
▶️Answer/Explanation
Answer: D) speed increases at a constant rate with time
Explanation: In free fall, the speed of an object increases at a constant rate due to the acceleration caused by gravity, resulting in a linear increase in speed over time.
Question
What does the area under a speed–time graph represent?
A acceleration
B average speed
C distance travelled
D total time taken
▶️Answer/Explanation
Ans :A
Question
The graph shows how the speed of an object varies with time.
How is the motion of the object described during the time shown by the graph?
(A) moving at the start, then increasing speed with constant acceleration
(B) moving at the start, then increasing speed with increasing acceleration
(C)) starting from rest, then increasing speed with constant acceleration
(D) starting from rest, then moving at a constant speed
▶️Answer/Explanation
Ans: A
Question
The diagram is the speed–time graph for a moving object.
What happens to the acceleration of the object during the time represented by the graph?
(A) It decreases.
(B) It increases.
(C) It is greater than zero and stays constant.
(D) It is zero and stays constant.
▶️Answer/Explanation
Ans: C
Question
The graph shows how the speed of an object varies with time.
Which graph is the distance–time graph for this object?
▶️Answer/Explanation
Ans : D
Question
Which diagram shows the distance–time graph for an object moving with constant speed?
▶️Answer/Explanation
Ans : A
Question
The graph shows how the speed of an object varies with time.
What is the distance moved by the object between time 0 s and time 10s?
(A) 30 m (B) 40 m (C) 50 m (D) 80 m
▶️Answer/Explanatio2
Ans : C
Question
The speed–time graph represents part of a car journey.
How far does the car travel in the part of the journey shown?
(A) 20 m
(B) 45 m
(C) 70 m
(D) 90 m
▶️Answer/Explanation
Ans : C
Question
A car travels 100 m in the first 10 s of a journey and 300 m in the next 15 s.
What is the average speed of the car for this 25 s journey?
(A) 5.0 m/s (B) 8.0 m/s (C) 15 m/ s (D) 16 m/s
▶Answer/Explanation
Ans : D
Question
A car travels at constant speed. It is at point X at time = 0.
Which distance–time graph and speed–time graph represent the motion of the car?
▶️Answer/Explanation
Ans: A
Question
The graph shows how the speed of an object varies with time.
The speed of the object is v at time t.
Which expression gives the distance travelled by the object in time t?
(A) \(\frac{1}{2}\left (\frac{v}{t} \right )\) (B) \(\frac{v}{t}\) (C) \(\frac{1}{2}\)vt (D) vt
▶️Answer/Explanation
Ans: C
Question
A person runs 5000 m in 1200 s and then walks a further 3000 m in 1800 s.
What is their average speed for this journey?
(A) 1.7 m/s
(B) 2.7 m/s
(C) 2.9 m/s
(D) 5.8 m/s
▶️Answer/Explanation
Ans: B
Question
A motor lifts a load vertically upwards at constant speed. The weight of the load is known.
Which of the other quantities in the table must be known to determine the useful power output of the motor?
▶️Answer/Explanation
Ans: A
Question
A man climbs up a vertical cliff that is 60 m high. He takes two hours to reach the top. What is the average vertical speed of the man?
A. 0.0083 m/s
B. 0.50 m/s
C. 30 m/s
D. 120 m/s
▶️Answer/Explanation
Answer: A. 0.0083 m/s.
Explanation: Average speed = total distance / total time. The distance is 60 m, and the time is 2 hours (7200 seconds). Therefore, speed = 60 / 7200 = 0.0083 m/s.
Question
The speed-time graphs represent the motion of a car moving in a straight line.
Which graph represents the car moving first with a constant acceleration, then with a larger constant acceleration and then with a constant speed?
▶️Answer/Explanation
Answer: D
Explanation: Graph D shows the car accelerating at a constant rate, then accelerating at a larger constant rate, and finally moving at a constant speed (horizontal line).
Question
Which speed-time graph represents an object travelling at constant speed?
▶️Answer/Explanation
Answer: A
Explanation: A constant speed is represented by a horizontal line on a speed-time graph, as the speed does not change over time. Graph A shows this horizontal line.