# UMass Amherst PHYSICS 131 - Physics 131 Lab Report 1 (4 pages)

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## Physics 131 Lab Report 1

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- Pages:
- 4
- School:
- University of Massachusetts Amherst
- Course:
- Physics 131 - Intro Physics I

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Free Fall Experiment Thursdays 9 00 AM ILC S110 June 1 2017 Abstract In this experiment we measured the position and velocity of a golf ball in free fall The time elapsed and position at the points of free fall as well as the velocity of each is graphed Our objective was to calculate the acceleration of gravity which we calculated as 10 2 m s 2 So we could conduct a reaction time experiment where we would be able to calculate the time it took for a subject to catch the ruler when dropped based on the gravity value we had previously found and the point on the ruler in cm that the subject caught it at Questions Answers 1 When you first observed the data of position vs time the parabolic curves open upward not downward Explain why The parabolic curve opens upwards because it shows where the golf ball is at a point in time since it is in free fall and we are dropping it from above it starts at the highest point and falls downwards to the table and then upwards again as it bounces off the table creating an open upwards parabola 2 Plot a graph of velocity versus time for your data What does the slope of this graph physically represent Your data points should form a straight line What does this signify The slope of this graph represents the acceleration constant of gravity for our slope we got m 10 2 m s 2 The straight line signifies to us that the number for gravity is not changing throughout the experiment Figure 1 shows the velocity graph the red line indicates which points we used to find the slope 3 Is the free fall acceleration constant Based upon the plot of velocity vs time how do you know it is constant Yes the free fall acceleration is constant This is a measurement of the force of gravity on earth which does not change unless something else is acting on it Since in this experiment the only force is gravity it remains constant throughout by looking at the graph you can see that each of the lines have the same or close to the same slope Figure 2 shows the slopes in red of each peak which corresponds to each time the ball fell and bounced back up 4 When the ball bounces off the floor and is moving upward is it still in free fall Explain why Yes the ball is still in freefall because the only force that is acting on it is gravity which allows it to bounce back up The ball is considered to be in free fall until another force besides gravity acts upon it or it stops moving 5 Is it possible for the ball s velocity and acceleration point in different directions Describe in your graph of velocity vs time when this would occur It is possible for the ball s velocity and acceleration to point

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