Lab 4 Report

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Apr 3, 2024

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Phys 1020 Physics Concepts I Names: Section: Date: Phys 1020 Lab 4 Report Activity 1-1: Motion of a Falling Ball Prediction 1-1: Toss a ball straight up a couple of times and observe its motion as it falls downward . Describe in words how you think it might be moving. Some possibilities include falling at a constant velocity, falling with an increasing acceleration, falling with a decreasing acceleration, or falling with a constant acceleration. What do you think? Explain how you based your prediction on your observations of the ball’s motion. (1 point) It falls at a constant velocity with increasing acceleration until it hits the ground. I think this because it is going faster while going in the same direction. Prediction 1-2: Suppose that you drop the ball from a height of about 2 m above the floor, releasing it from rest. On the axes that follow, sketch your predictions for the velocity-time graph and acceleration-time graphs of the ball’s motion. Assume that the positive y direction is upward . (1 point) 6 . Print your graphs. (1 point) Page 1 of 5 Insert Menu  Shapes

Phys 1020 Physics Concepts I Question 1-1: What does the nature of the motion look like – constant velocity, constant acceleration, increasing acceleration, decreasing acceleration, or other? How do your observations compare with the predictions you made? (1 point) for the start the predictions was right, constant acceleration and velocity while it was dropping until it hit the ground and bounced. Question 1-2: What motion of a different object, observed in a previous lab, resulted in similar graphs to the ones for the falling ball? Describe what was moving and precisely how it was moving. (1 point) When we were walking towards and away from the motion detector. It showed acceleration going away from the motion detector and acceleration coming back along with velocity. Question 1-3: Is the acceleration of the ball positive or negative as it falls down? Does the sign agree with the way that the velocity appears to be changing on the velocity-time graph? Explain (2 points) Negative, and it does seem to be the same with velocity. Because the ball is falling down away from the motion detector, velocity is negative because it is going away and the acceleration is negative because its going away from the detector. Activity 1-2: The Magnitude of Gravitational Acceleration Page 2 of 5

Phys 1020 Physics Concepts I 1. For Method 1, use the analysis and statistics features . (1 point) Average acceleration: m/s 2 2. For Method 2, use the fit routine . (1 point) Average acceleration: m/s 2 Question 1-4: Did the two values for the gravitational acceleration agree with each other? Should they agree with each other? (1 point) They do not agree with each other. They should agree with each other because acceleration should be the same. Activity 1-3: Motion Up and Down Prediction 1-3: Suppose that you toss a ball upward and analyze the motion as it moves up, reaches its highest point, and falls back down. Is the acceleration of the ball the same or different during the three parts of the motion – moving upward, momentarily at the highest point, and moving downward? Explain. (1 point) The acceleration will change from negative to positive because it is changing direction, throwing it upwards is it going backwards, so backwards acceleration, so negative acceleration, then when it goes down, is it going forward acceleration so positive acceleration Prediction 1-4: Sketch on the axes below your predictions of the velocity-time and acceleration-time graphs for the entire motion of the ball from the moment it leaves your hand until just before it returns to your hand. Assume that the positive direction is upward. (1 point) Page 3 of 5 -9.83 -0.998 Insert  Shapes

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Phys 1020 Physics Concepts I 2 . Print the graph. (1 point) Question 1-6: Compare the graphs to your predictions. In what ways do they differ and in what ways are they the same? (1 point) they are almost the same because at the start we have both of them positive then negative. Only thing that is different is the velocity goes negative when the acceleration goes positive that is where we got the predication wrong. Question 1-7: What motion of a different object, observed in a previous lab, resulted in similar graphs to the one for the ball thrown up in the air? Describe what was moving and precisely how it was moving. (1 point) When we were doing the walking lab, when we walked towards the motion detector the acceleration was positive and the same is here. Question 1-8: Qualitatively compare the acceleration during the three parts of the motion – on the way up, at the highest point, and on the way down. Explain your observations based on the sign of the change in velocity, as you did in Lab 2. (1 point) the start the acceleration was positive, then it declined slightly in the middle, then it went straight negative then straight positive then back in the middle again. Page 4 of 5

Phys 1020 Physics Concepts I Question 1-9: Compare the portion of the acceleration graph when the ball was falling downward (after reaching its highest point) to the acceleration graph from Activity 1-1 where the ball was falling from rest. Are they similar? Explain why or why not. (1 point) They are, they both have a slight decrease into the negatives for acceleration then sorta levels out. This is because they both are falling in the same direction from a similar height. Page 5 of 5

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