LabQuest 8 Projectile Motion You have probably watched a ball roll off a table and strike the floor. What determines where it will land? Could you predict where it will land? In this experiment, you will roll a ball down a ramp and determine the ball’s velocity with a Photogate. You will use this information and your knowledge of physics to predict where the ball will land when it hits the floor. Figure 1 OBJECTIVES ● Measure the velocity of a ball using a Photogate. ● Apply concepts from two-dimensional kinematics to predict the impact point of a ball in projectile motion. ● Take into account trial-to-trial variations in the velocity measurement when calculating the impact point. MATERIALS LabQuest plumb bob LabQuest App ramp 2 Vernier Photogates ring stand target right-angle clamp ball (1 to 5 cm diameter) meter stick or metric measuring tape masking tape Physics with Vernier 8 -
Experiment 19 PRELIMINARY QUESTIONS 1.If you were to drop a ball, releasing it from rest, what information would be needed to predict how much time it would take for the ball to hit the floor? What assumptions must you make? 2. If the ball in Question 1 is traveling at a known horizontal velocity when it starts to fall, explain how you would calculate how far it will travel horizontally before it hits the ground. 3. When an object passes through a Photogate, it blocks the passage of light from one side to the other. The interface can accurately measure the duration of time that a gate is blocked. If you wanted to know the velocity of the object, what additional information would you need? PROCEDURE 1. Set up a low ramp made of angle molding on a table so that a ball can roll down the ramp, across a short section of table, and off the table edge as shown in Figure 1. 2. Position the Photogates so the ball rolls through each of the Photogates while rolling on the horizontal table surface (but not on the ramp). Approximately center the detection line of each Photogate on the middle of the ball. To prevent accidental movement of the Photogates, use tape to secure the ring stands in place.
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