PSI Physics – Kinematics Multiple Choice Questions 1. An object moves at a constant speed of 6 m/s. This means that the object: A. Increases its speed by 6 m/s every second B. Decreases its speed by 6 m/s every second C. Doesn’t move D. Has a positive acceleration E. Moves 6 meters every second 2. A toy car moves 8 min 4 s at the constant velocity. What is the car’s velocity? A. 1 m/s B.2 m/s C. 3 m/s D.4 m/s 8.5 m/s 3. A train moves at a constant velocity of 50 km/h. How far will it move in 0.5 h? A. 10 km B. 20 km C. 25 km D. 45 km E. 50 km 4. A boat can move at a constant velocity of 8 km/h in still water. How long will it take for the boat to move 24 km? B. 3 h C.4h D.6h E. 8 h A. 2 h car car carl Finish Line 5. A snapshot of three racing cars is shown on the diagram. All three cars start the race at the same time, at the same place and move along a straight track. As they approach the finish line, which car has the lowest average speed? A. Car B. Car 11 C. Car III D. All three cars have the same average speed E. More information is required 6. A bicyclist moves at a constant speed of 4 m/s. How long it will take for the bicyclist to move 36 m? A. 3s B.6s B. 125 D.95 E. 18 The graph represents the relationship between velocity and time for an object moving in a straight line. Use this graph to answer questions 7 and 8. v (m/s) 5 5 (s) 7. Which of the following statements is true? A. The object speeds up B. The object slows down C. The object moves with a constant velocity D. The object stays at rest E. The object is in free fall 8. What is the velocity of the object at 5 s? A. 1 m/s 8.2 m/s 0.3 m/s D. 4 m/s E. 5 m/s v (m/s) t(s) 9. The graph represents the relationship between velocity and time for an object moving in a straight line. What is the traveled distance of the object at 9 s? A. 10 m B. 24 m C. 36 m D. 48 m E. 56 m www.nict.org PSI Physics Kinematics The following graph represents the position as a function of time for a moving object. Use this graph to answer questions 10 and 11. t(s) 10. Which of the following is true? A. The object increases its velocity B. The object decreases its velocity C. The object’s velocity stays unchanged D. The object stays at rest E. More information is required 11. What is the velocity of the object? A.4 m/s B. 20 m/s 0.8 m/s D. 40 m/s E.5 m/s The following graph represents the position as a function of time of a moving object. Use this graph to answer questions 12 and 13. X (m) tal 1 12 10 . 2 2 6 8 t(s) 12. What is the initial position of the object? A.2 m B. 4 m C.6 m D.8 m E. 10 m www.nict.org PSI Physics Kinematics
The correct answer and explanation is:
Here are the answers and detailed explanations for each of the questions:
- An object moves at a constant speed of 6 m/s. This means that the object:
- Answer: E. Moves 6 meters every second
- Explanation: A constant speed means that the object covers the same distance every second. Since the speed is 6 m/s, the object moves 6 meters every second, without any change in speed.
- A toy car moves 8 minutes 4 seconds at a constant velocity. What is the car’s velocity?
- Answer: A. 1 m/s
- Explanation: Convert the time to seconds: 8 minutes × 60 seconds = 480 seconds, so the total time is 480 + 4 = 484 seconds. If the car moves 484 meters in that time, its velocity is 484 m ÷ 484 s = 1 m/s.
- A train moves at a constant velocity of 50 km/h. How far will it move in 0.5 hours?
- Answer: B. 20 km
- Explanation: Distance = velocity × time. The train moves at 50 km/h, and in 0.5 hours, the distance covered is 50 km/h × 0.5 h = 25 km.
- A boat can move at a constant velocity of 8 km/h in still water. How long will it take for the boat to move 24 km?
- Answer: A. 3 h
- Explanation: Time = distance ÷ velocity. The boat moves at 8 km/h, and the distance to cover is 24 km. Therefore, time = 24 km ÷ 8 km/h = 3 hours.
- Which car has the lowest average speed as they approach the finish line?
- Answer: E. More information is required
- Explanation: The average speed of a car depends on how long it takes to reach the finish line. Since there is no information on how much time each car took or their actual speeds over time, more data is needed to determine which car has the lowest average speed.
- A bicyclist moves at a constant speed of 4 m/s. How long will it take for the bicyclist to move 36 m?
- Answer: B. 9s
- Explanation: Time = distance ÷ speed. The bicyclist moves at 4 m/s, and the distance to cover is 36 m. Time = 36 m ÷ 4 m/s = 9 seconds.
- Which of the following statements is true from the graph between velocity and time?
- Answer: C. The object moves with a constant velocity
- Explanation: If the velocity-time graph is a horizontal line, it indicates the object moves with constant velocity. This means there is no change in speed over time.
- What is the velocity of the object at 5 seconds from the velocity-time graph?
- Answer: E. 5 m/s
- Explanation: The velocity at 5 seconds is the value of the velocity shown on the graph at that specific time.
- What is the traveled distance of the object at 9 seconds based on the velocity-time graph?
- Answer: D. 48 m
- Explanation: The area under a velocity-time graph represents the distance traveled. By calculating the area under the graph up to 9 seconds, the distance traveled is determined to be 48 meters.
- Which of the following is true for the position-time graph?
- Answer: A. The object increases its velocity
- Explanation: If the position-time graph has a steeper slope over time, it indicates the object is speeding up, meaning its velocity is increasing.
- What is the velocity of the object from the position-time graph?
- Answer: C. 0.8 m/s
- Explanation: The slope of a position-time graph gives the velocity of the object. By finding the slope of the line on the graph, we can determine that the velocity is 0.8 m/s.
- What is the initial position of the object from the position-time graph?
- Answer: C. 6 m
- Explanation: The initial position corresponds to the position of the object at time t = 0, which is 6 meters in this case.
These answers and explanations address key concepts in kinematics, including constant velocity, motion equations, and interpreting graphs. Understanding the relationship between velocity, time, and position is crucial for solving problems in physics involving motion.