Question

10. Move the Motion Sensor. Place the Motion Sensor at the bottom of the track pointing up the track. 11. Check the Motion Sensor. Start with the cart at least 50 em in front of the sensor. Practice pushing the cart up the track so the cart doesn't go over the top of the track and stopping the cart before it gets within the 50 em of the sensor. Start the sensor and push the carit up the track. Stop the cart before the 50 em limit. The position vs. time graph should show the entire motion of the cart. If it doesn't, adjust the sensor and try again.

Answer 1

14. For two sensors, one at bottom of the ramp and other at top of the ramp, only position-time graph will differ. Other graphs will be same.

In position time graph too, the nature of the both graphs will be same but the inital position will be different in each cases, this depends on the exact setup of the experiment.

15. At the fartherest point, the velocity of the cart becomes zero.

The acceleration doesn't become zero, infact the accleration remains constant in whole experiment. The cart starts with an inital velocity opposite to the acceleration. Becasue of this opposite acceleration the cart velocity decreases gradually and becomes zero at the fartherest point. At this instant, acceleration does not changes, and thus velocity starts increasing in the direction of acceleration.

16. In position-time graph, change in the direction occurs, When the position reaches maximum point.

17. In velocity-time graph, change in the direction occurs, When velocity becomes zero (ie. when the plot crosses the time axis).