Question

The motion of an object is represented by the 12. A student investigntes the motion of a ball rolling speed-time graph shown. down a slope. The diagram shows the apeed vof the ball at different timest. Which quantity is equal to the area under the graph? A. acceleratien B. average speed c. distance travelled D. kinetic energy Which statement describes the motion of the ball? A. The acceleration is not constant. B. The acceleration is negative. 10. Two runners take part in a race. The graph shows how the speed of each runner changes with C. The speed is decreasing. time. D. The velocity is constant. 13. The graph shows how the speed of a car changes with time over part of a journey. What does the graph show about the runners at time th A Both runners are moving at the same speed B. Runner 1 has zero acceleration Which section of the graph shews acceleration and which section of the graph showi deceleration? C. Runner 1 is overtaking runner 2 D. Runner 2 is slowing down 14. The graph shows how the speed of a van changes 17. The speed-time graph represents the motion of a with time for part of its joumey. In which labelled car travelling along a straight level road. section is the van decelerating? Which statement describes the motion of the car? A. It accelerates and reaches a constant speed A. A B. It accelerates and then stops moving B. B C. It decelerates and then reaches a constant speed C. C D. It decelerates and then stops moving D. D 15. A girl goes for a ride on her bicycle. The diagram sbows how ber speed changes with time for part of her journey. In which labelled section is she maving with constant speed? In which part of the graph is the acceleration equal to zero? constant speed? A. A A. A II. B] B. B C. E C. C B. D D. D 16. The graph shows how the speed of an object 17. An object is travelling in a straight line. The varies with time. At widch labelled time is the diakran is the speed-time graph for the object: acceleration greatest? At which labelled point in the object accelerating at a

Answer 1

The quantity equal to the area under the speed-time graph is C. distance traveled.

The graph shows that the acceleration is not constant for the ball rolling down a slope.

Step-by-step explanation:

12. The area under a speed-time graph represents the displacement or distance traveled by an object. Therefore, the correct choice is C, indicating that the quantity equal to the area under the graph is the distance traveled by the ball.

Analyzing the speed-time graph for the ball rolling down a slope, the variable area represents the change in distance traveled. Acceleration is not directly determined from the area under a speed-time graph; instead, it can be calculated from the slope of the graph at various points. The correct choice is A, indicating that the acceleration is not constant, which is evident from the changing slope of the speed-time graph.

Understanding the interpretation of speed-time graphs is essential in physics. The area under the graph provides information about the displacement or distance traveled, while the slope of the graph at a given point gives insights into the instantaneous acceleration. These concepts are fundamental in describing and analyzing the motion of objects.