Air Resistance As A Source Of Error
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mistake. Examples would be when you set up your experiment incorrectly, when you misread an instrument, or when you make a mistake in a calculation. Human errors are not a source of experimental error; rather, they are types of error in experiments “experimenter's” error. Do not quote human error as a source of experimental error.
Common Sources Of Error In Physics Labs
Systematic error is an error inherent in the experimental set up which causes the results to be skewed in the same direction sources of error in experiments every time, i.e., always too large or always too small. One example of systematic error would be trying to measure the fall time of a ping pong ball to determine the acceleration due to gravity. Air resistance
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would systematically reduce the measured acceleration, producing a systematic error. Some systematic errors can be easily corrected. For example, if a balance reads 0.25 g when there is no mass on it, this would introduce a systematic error to each mass measurement—they would all be too large by 0.25 g. This can be corrected by zeroing the balance. Other systematic errors can only be eliminated by using a different experimental setup. Most of the types of error in physics simple experiments you do will have some systematic error. All experiments have random error, which occurs because no measurement can be made with infinite precision. Random errors will cause a series of measurements to be sometimes too large and sometimes too small. An example of random error could be when making timings with a stopwatch. Sometimes you may stop the watch too soon, sometimes too late. Either case introduces random error in your measurements. (Note that when a human is involved in the actual measurement process, he/she can introduce valid experimental error that is not within the definition of human error. Your finite reaction time is not a mistake; it is a limitation of one part of the experimental process, the human making the measurement.) Random error can be reduced by averaging several measurements. ERROR ANALYSIS One way to analyze experimental error is with a % error calculation. The % error is useful when you have a single experimental result that you wish to compare with a standard value, or when you have two experimental values obtained by different means that you wish to compare. (In the latter case it is often called % difference since there is no standard to compare to.) The % error is calculated according to the following formula. In the
Some of the individual measurements were off by over 30%, but the average time measured was only off by 7%. I did a little exercise at
Sources Of Error In Physics Lab Projectile Motion
the start of my high-school physics class today that introduced different types of
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experimental error. We're starting the second quarter now and it's time for their lab reports to including more discussion about types of human errors potential sources of error, how they might fix some of them, and what they might mean. One of the stairwells just outside the physics classroom wraps around nicely, so students could stand http://www2.volstate.edu/Phy/PHYS2110-2120/experimental_error.htm on the steps and, using stopwatches, time it as I dropped a tennis ball 5.3 meters, from the top banister to the floor below. Students' measured falling times (in seconds). Random and Reading Errors They had a variety of stopwatches, including a number of phones, at least one wristwatch, and a few of the classroom stopwatches that I had on hand. Some devices could do http://montessorimuddle.org/2011/11/02/figuring-out-experimental-error/ readings to one hundredth of a second, while others could only do tenths of a second. So you can see that there is some error just due to how detailed the measuring device can be read. We'll call this the reading error. If the best value your stopwatch gives you is to the tenth of a second, then you have a reading error of plus or minus 0.1 seconds (±0.1 s). And you can't do much about this other than get a better measuring device. Another source of error is just due to random differences that will happen with every experimental trial. Maybe you were just a fraction of a second slower stopping your watch this time compared to the last. Maybe a slight gust of air slowed the balls fall when it dropped this time. This type of error is usually just called random error, and can only be reduced by taking more and more measurements. Our combination of reading and random errors, meant that we had quite a wide range of results - ranging from a minimum time of 0.7 seconds, to a maximum of 1.2 seconds. So what was the righ
Upload Documents Write Course Advice Refer your Friends Earn Money Upload Documents Apply for Scholarship Create Q&A pairs Become a Tutor Find Study Resources by School by Literature Guides by Subject Get Instant Tutoring Help https://www.coursehero.com/file/p12c4cm/Another-source-of-error-is-air-resistance-However-because-the-ball-is-traveling/ Ask a Tutor a Question Use Flashcards View Flashcards Create Flashcards Earn by Contributing http://schoolworkhelper.net/newton%E2%80%99s-second-law-lab-answers/ Earn Free AccessLearn More > Upload Documents Write Course Advice Refer your Friends Earn MoneyLearn More > Upload Documents Apply for Scholarship Create Q&A pairs Become a Tutor Are you an educator? Log in Sign up Home Villanova PHYS PHYS 2403 Lab 2 Another source of error is air resistance however SCHOOL Villanova COURSE TITLE PHYS 2403 TYPE Lab of error Report UPLOADED BY roshun.sangani PAGES 8 Click to edit the document details This preview shows pages 7–8. Sign up to view the full content. View Full Document acceleration does not take into account the friction between the car and the board. Another source of error is air resistance. However, because the ball is traveling at such a fast speed, it is likely that the error is mostly due to friction and affected by of error in air resistance by less than one percent. Figures 2.3 and 2.4 are designated for Part (B) of this experiment, when the cart traveled a certain distance, d, until the weight hit the ground. The distance that the ball and hanger travelled was 0.719 meters, which is necessary to help calculate the potential energy of the 0.5 km hanger. The potential energy of the hanger is equaled to the mass of the hanger, multiplied by g (9.8 meters per second squared), multiplied by the distance traveled in the y-direction (U=mgy). Meanwhile, the Kinetic energy equals the sum of the masses (mass of car + mass of hanger) multiplied by one half multiplied by velocity squared (). Figure 2 depicts the Potential Energy, Kinetic Energy and Total Energy of the system as a function of distance traveled. As the distance increases, the kinetic energy increases as well because the velocity increases and velocity is directly related to Kinetic Energy. However, as the distance traveled by the system increases, the potential energy decreases because the distance between the hanger and the ground begins to decrease. This is evident in Figure 2.3, where the Kinetic Energy is increasing at a constant rate while the Potential Energy is decreasing at a constant rate. As for Total Energy, it is theoretically supposed to
Newton’s Second Law Lab Answers Print PDF Equipment: Kinematics Cart 2 500g bar masses Kinematics Track 50g hanger Several 100g masses String Pulley iBook Computer USB Cable Motion sensor Purpose: How will the acceleration of an object’s mass (m) change when the net force acting on it changes? Prediction: We predict that the acceleration of an object mass will increase constantly when the net force acting on the object itself changes. This is because, if we keep the mass of the object constant and we increase the net force we will get a change in acceleration as stated and proved by Newton’s Second Law (Fnet = m * a – in where m = mass, a = acceleration, and Fnet =Fa) Observations: Hanging Mass (Kg) Acceleration (m/s/s) Force of Gravity (N) .5 .21 5 1.0 .42 10 1.5 .63 15 2.0 .85 20 2.5 1.06 25 3.0 1.27 30 Calculations: Force of gravity = mass x gravity (10 N) Fg1 = .50 kg x 10 N = 5 N Fg2 = 1.0 kg x 10 N = 10 N Fg3 = 1.5 kg x 10 N = 15 N Fg4 = 2.0 kg x 10 N = 20 N Fg5 = 2.5 kg x 10 N = 25 N Fg6 = 3.0 kg x 10 N = 30 N Proportional Statement: a ~ FgGeneral Equation: a = k * FgNote: k is equal to slope of Acceleration vs Net Forcek = rise/run = 1.27-0.21/30-5 = 1.06/25 = .0424Specific Equation: a = .0424 * FgProof: Fg1 = 5: a = .0424 * 5 = .212 Fg2 = 10: a = .0424 * 10 = .424 Fg3 = 15: a = .0424 * 15 = .636 Fg4 = 20: a = .0424 * 20 = .848 Fg5 = 25: a = .0424 * 25 = 1.06 Fg6 = 30: a = .0424 * 25 = 1.272 Analysis: From the data that was taken during this investigation we can see that this graph shows accelerations that change constantly at the same rate. Throughout this experiment the hanging mass (force) is increased which reduces the amount of air resistance it faces, thus making the acceleration faster, but still constant with the other accelerations. Conclusion / Source of Errors: We learned that our prediction at the start of this experiment was proven to be correct. We hypothesized that as the mass on the hanger increases, the air resistance, will decrease, thus the acceleration of the object towards the center of the earth would be increased. The relationship between the acceleration and mass is proportional. It shows that the acceleration is directly proportional to the mass. This experiment proved