Question

KINEMATICS AND DYNAMICS 1. Velocity versus time graphs for five objects are shown below. All axes have the same scale. Which object had the greatest change in position during the interval? Time To the right is a graph of an object's position. Which sentence is the best interpretation of the motion of the object as shown by the graph? 2. A. The object is moving with a constant, non- zero acceleration. B. The object is not moving. C. The object is moving with a uniformly Time increasing velocity. The object is moving with a constant velocity D. E. The object is moving with a uniformly increasing acceleration 3. Which of the velocity-time graphs in diagram 1-83 above best illustrates a car braking to a stop? 4. t takes Felicia 15 minutes (0.25 hour) to ride her bike to school from home. Using her speedometer, she notes that her maximum speed was 16 km/hour and she figured and her school? A. 2.5km B. 10km C. 4.0 km D. 16 knm E. 150 km

Answer 1

1. The area under velocity-time graph gives us the displacement of the object.

out of all the given figures, it is clear that the figure (B) has greatest area. Hence. te figure (B) is showing the greatest change in position.

2. The slope of the position-time graph gives us the velocity of the object.

Here, we can see that the plot is a straight line. It means that the slope is constant throughout the motion.

So, the velocity of the particle is constant throughout the motion.

So, only the option (D) is correct. i.e. The object is moving with a constant velocity.

3. If the car is breaking to the stop, it means that the final velocity of the car will be zero.

So, we can see that only in the figure (D) the final velocity is getting zero.

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