For the parent-teacher on a budget, we offer economical triple beam balances and electronic digital scales. (I recorded the height on the lab write-up for you). Use Newton’s Third Law to explain your observations in Post-Lab Questions 1 and 2. Which type of simple machine is pictured here? The You can even slow time. Digital readouts: The next most common case involves measurements made with a digital readout. 3. 3) control variables 4) Recognize that some things are hard to measure like friction because the spring scale needle vibrates. 0.008 kg Suppose the ball was floating in outer space (away from the gravity of the earth, friction, or any other influence) and that Newton's Second Law holds. In this lab, we will use spring This mass is also in static equilibrium. The springs are 6 cm long and 0.8 cm in diameter. A spring scale works on a principle discovered in the 17th century by Robert Hooke. Then calculate what the friction force must have been. How far will the spring stretch if you add another watermelon of equal mass? Measure the length of the ramp (inclined plane) in meters; record. Or see how the physics behind them works with mechanical balances and scales, including models from Ohaus. Attach one end of the string to the cart and the other end to the spring scale. The second team member will hold the third string-loop and its spring scale, adjusting the position of the string's loop on the washer until the spring scale reading is between 10 N and 20 N. When equilibrium has been reached, the third member will slip a piece of unlined paper under the washer and use dots to mark the center of the washer as well as the positions of each string. Pull the box with the spring scale at constant velocity, exerting the force at an angle of 30° to the horizontal. It makes use of a "vernier scale" which allows one to make more accurate measurements than a simple pointer and scale apparatus. Spring scales can be used to measure a variety of forces. How can we use measurements that we know contain errors or uncertainty to make valid predictions or reach You will measure frictional forces using a spring scale to measure the force. However, you may use your lab manual, graded lab reports, notes, and textbook as resources for this exam. Based on your lab work, determine the mechanical advantage for each pulley system. Answer the questions on the data table page. This course includes the option of hands-on or dry lab activities. Friction Lab Friction is a force that occurs when two surfaces TOUCH. Appendix B. An advantage would be the accuracy of a spring scale… Three springs have a spring constant of 5 N/m and the other three have a spring constant of 15 N/m. a) 60 grams b) 10 grams c) 600 grams d) 0 grams. inches). Below are all the labs available on this site. What will be the readings on the scales? A spring generates a force proportional to how far it is stretched (and acting in the opposite direction to the stretch) F spring = −k × stretch If we adjust the coordinate system so that x = 0 corresponds to the spring being unstretched, then the stretch of the spring is simply equal to x. 20. Use the balance or electronic scale (but not the spring scale) to determine the mass of the rubber ball in kg, and write it in the space below. Are measurements ever exact? Liquid water is more dense than ice because a) A liquid H 2 0 molecule has more mass than an ice H 2 0 molecule. October 2016 1 of 5 . inches by 12 sq. This causes the spring to stretch as shown. Inclined Plane Lab ... Once the inclined plane is set up, a cart is placed upon the inclined plane. With nothing attached to the hook, make sure the scale reads zero. The scale on earth reads 60 grams. For this lab in particular, a disadvantage is that some of these objects are not made to hook onto a spring scale, thus skewing the results. Homework Statement A 20-kg fish is weighed with two spring scales, each of negligible weight. A spring scale or spring balance or newton meter is a type of mechanical force gauge or weighing scale.It consists of a spring fixed at one end with a hook to attach an object at the other. Lab Materials . Spring Scale Lab Adapted from Minds on Physics: Inquiry Activity #41 &Concepts & Challenges:Physical Science Using a Spring Scale, page 253 Goal: In this activity you will learn to use a spring scale to measure the weight (force of gravity) in newtons. Pull on the spring scale until you have a good kinesthetic sense of a one Newton force. LEVER LAB Part 1 - 1st Class Levers In this part of the lab you will find out how changing the position of the resistance arm affects the mechanical advantage. Zero the spring scale as follows. To the 200 line. Click on the picture or the program title to go to the program or click on "See Resources" to see a description of the program and all the resources that go with this program. Then, calculate the weight needed to lift each load in the pulley systems. Laboratory scales for scientists and laboratory professionals. Assume that the spring scale is being pulled down similar to each of your labs. Place the object in the tray c. With the spring scale, lift one side of the object 10 cm off the tray d. Transport the lab to different planets. Having trouble with this tricky physics problem, anyone have an idea of what the answer would be? A realistic mass and spring laboratory. Materials Needed : 4 wood blocks for each lab group (approximately 2 inches x 3 inches x 6 inches is a good size because then the ratio of areas of the different sides is simple- 6 sq. ... Also, answer any questions which the TA assigns. Hang masses from springs and adjust the spring stiffness and damping. Lab Manual • Each lab contains complete instructions – there is no lab … Answer: When the spring balance with stone is immersed in water, the stone experiences an upward force called buoyant force. 4. • Dry labs have no required materials. Both the resistance and … ... Measure the tension on each spring scale and record your answer to two decimal places. 7. 2.Compare the magnitude of the forces on both spring scales after you pulled the 10 N spring scale suspended on the 5 N spring scale. A vernier scale can usually be read to only about ± 1 division. Purpose: In this lab we will experimentally calculate the mass of a suspended weight by placing the weight in static equilibrium and measuring the tension in 6 locations. 1. Question 1: Why does the pointer of a spring balance move up when the stone suspended from it is immersed in water? Lever Wedge Incline plane Wheel and axle 13.In the photo, which part provides the resistance force? A spring scale is used to exert a force ... the entire class works together and compiles data in an effort to answer a … In this packet, we’ll answer questions like this: What do scientists mean when they say error? Spring Scales Tray Ruler Procedures Lifting Force, Static Friction, Sliding Friction 1. A chart shows the kinetic, potential, and thermal energy for each spring. A spring scale will be used to measure the resistance and the effort involved. Explain your answer using a force diagram and net force equation. The spring force becomes. a. Use the search engine to help you find a particular lab. This accessory kit contains 6 springs that are ideal for physics experiments. How can a measurement that is uncertain be useful? inches by 24 sq. At the grocery store, you put a watermelon on a produce scale. F spring … Tie a string around one side of your object and attach it to your spring scale b. Thus, the spring scale/string is in static equilibrium. Procedure: Set up the inclined plane so the height of the ramp is 30 centimeters. So we find that the static friction has a maximum value. In the photo which labeled part is the fulcrum C B D A 15.what is the effort force in the lab photo? How can we tell if our measurements have been affected by error? Our selection of lab scales include precision balances, analytical balances and moisture analyzers. When our block is at rest, and we pull it with the spring scale, as we increase the tension the block stays at rest, until we reach a point where it begins to move. Calculate the efficiency (work lifting the mass/work pulling the spring scale x 100%) and mechanical advantage (weight lifted/spring scale force) for one trial of apparatus A & B (and C if you did it). It works by Hooke's Law, which states that the force needed to extend a spring is proportional to the distance that spring is extended from its rest position. Give the value of the pull force that you measured. The lower FBD depicts the applied forces for the submerged mass. Up to that point, friction has been merely balancing the force we are applying with the spring scale. • Hands-on labs require the materials listed below. Once the lab exam begins, you are not permitted to receive any assistance from your TA or other students. You need to hang enough mass to the end of the spring to get a measurable stretch, but too much force will permanently damage the spring. 12. Make chemistry labs easier easy with a digital scale! NCERT LAB MANUAL QUESTIONS. Your answer will be graded based on the accuracy of your result and proper reporting of uncertainty, significant figures, and units. Lab 7 Buoyancy Experiment Type: Cookbook Overview In this experiment, ... Part III: Finding the Specific Gravity (using a spring scale) Now let’s use our knowledge of the buoyant force to determine the density! A spring scale is used to measure the mass of an object on earth. Find the force required to lift your object. A. Be sure to clamp the ring stand to the lab table, or weight it with several books so that the mass does not pull it off the table. In this lab you will investigate the factors that affect friction. Cart meter stick 5 N & 10 N spring scale. Student Exploration: Determining a Spring Constant Prior Knowledge Questions 1. On the moon the scale would read. 1. Answer: It has no unit, as it is a ratio of similar quantities. Then place the pumpkin on the spring scale and record its weight. Introduction Lab Options . Each scale will read 10 kg B. Ruler (c) Clay block (d) Wooden cube and clay (b) Spring scale (a) 14. 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