You may have to scroll after the clicks to get to the buttons. Finally, I reveal that the answers are graph B for position over time and graph F for velocity over time. Let's start by looking at a specific example of accelerated motion. A motion sensor is located at the top of the track, so the cart accelerates away from the motion sensor. Apparatus 2 Double-click the Logger Pro icon on your computer screen. The error on your velocity calculated in this way is found using the propagation of errors technique for finding 1 Elevate the track using the 3-cm spacer.
He is assuming that you understand that the car is merely gaining speed, not randomly changing speed in a number of different random directions. The velocity versus time graphs produced by motion detector software are often, if not usually, irritatingly irregular. It is constant and points straight down. By creating a release button that would operate both devices it would synchronize them and ensure the data was precise. In conclusion, the velocity time graph of the cart down the ramp had a relative, if not completely linear shape. The data collected from this experiment was quite accurate and testing was performed quite smoothly, however as stated early, there is always room for improvement.
In other words, what are some possible sources of error? If we look at the slopes of the tangent lines drawn to a curve for this position-time information we see that their slopes are all positive and get increasingly steeper. You need to stop the timer before the weight hits the floor. In other words, the bullet is traveling at the same speed it had when it was just fired, only in the opposite direction. Let us find the velocity of the ball as a function of time. On the other side of the card, students record a negative change in their learning, such as a concept that needs more clarification or a part of the activity that was particularly difficult.
Attach the motion detector a ring stand, and c-clamp the ring stand to the lab table. The first improvement would be the creation of a tool to allow one person to operate both the ticker tape timer and release of the car. Before beginning to collect data, take a moment to practice rolling the cart up the ramp with the data recording turned on. The clip shows a ball being dropped. Does it resemble a straight line? And, if I display the random generator on the front board, there is an element of suspense as the partners are being assigned. If not, what does it look like? You should be able to record at least two or three bounces of the basketball. Catch the cart before it hits the end of the track and keep it motionless until the data collection stops you will hear the sonic ranger stop clicking.
I present this information and the students are passive at this point, so that the entire class has a clear understanding of what the moving man in our example is doing. This log will form the basis of your lab report. As students finish recording their thoughts on the cards, they bring them forward and put them on my desk. The velocity of the object is calculated by the software based on the time between successive positions, so small errors in position are magnified into very noticeable errors in velocity. You should see graphs that look similar to those shown in Figure 5.
Even though the change in air resistance might be minor, it is still another source of error that can lead to miscalculation. Observation Hold a tennis ball at about your height and then let go. Then plot that average velocity as the dependent variable on a velocity-time graph; plot time as the independent variable. I save these cards and read them during my next free time so that I can adjust my teaching and the assignment if needed. This created the possibility for the cart to be released slightly before or after the ticker tape timer was activated.
You may use Excel or DataStudio for three of the graphs. Be sure to tell why you think whatever you think, how confident you are in your conclusions, and why. We use MacBook Pro's in my district, so my students are familiar with how the computer and cart organization works. It shows that the acceleration is directly proportional to the mass. Then plot each displacement value in accordance with its time interval on a position-time graph. Physics Laboratory 2 Physics Laboratory 2 Free-fall - The acceleration of gravity Gravity is the force of nature we are most aware of.
When you are ready to take data, turn on the data recording and then launch the cart uphill so that it stops before reaching the end of the track and then rolls back down the ramp to its starting position. Even though it is treated as frictionless, friction is always present everywhere, even if it is regarded as not present. Physics Lab: Is This Constant Acceleration? Throughout the experiment we have not considered the force of friction. If not, what does it look like? How do we know what goes on deep in the bowels of the software? Is the graph a horizontal line, or not? What was his average speed in the first 8 seconds? Doing this quick assessment gives me an idea of my students' comfort levels with motion graphs. For the initial run, do not add any extra weight to the fan cart.
To me, this means that they are on the proper website, reading or discussing some component of the simulation, and writing down appropriate information from the simulation here's what a should look like. You will automatically step to the next frame of the video clip. After everyone is settled, I advance to the and ask students to consider the information presented. Double-click this and then select the Motion Detector file. This would eliminate the variation of places the car could start and finish from and the chance of the car falling of the board near the end of its run. It is hard to get detailed information about its motion without using external measuring instruments.
After everyone has returned to their original seat, I tell students to start thinking about a positive change and a negative change that occurred in their thinking today. My students don't need much guidance with this since they are familiar with the process, so it only takes a minute or two for everyone to clean up. Equipment Error: During the experiment there were difficulties that sometimes occurred with the ticker tape timer. Because this activity does not need to be completed outside of class, I feel comfortable in choosing the pairings for my students. In this experiment the instrument is a video camera.